 typically 5 seconds, with 5 and 10 being fairly rare, but 15/20/30 common, and 60 also being semi common. In a recorded show, everything is timed out to the fraction of a second. In a recorded show, your local TV station is given the runtimes of the show (currently around 17-20 minutes for a 30 minute show), and given the number of national commercials (and the tape for those commercials), and allowed to fill the rest with local commercials. Each day or week, someone will cut, or edit, the commercial blocks for each hour that the station is responsible for broadcasting the commercials for, and the station switches to that tape when it's required.

However, on a live broadcast, things get a little bit more tricky, because while everything (such as a news broadcast) is timed out to the second as well, things don't always go to plan, and things get cut off. Typically, the station will prefer to cut a story or some other facet of the broadcast out, and make sure the commercials air in full, because if they DON'T air the entire commercial, they "owe" that company an equal block of time. However, things are compounded when it's something like a sporting event, that the station can't dictate the pace of. They just need to know how much time they're supposed to have, and ensure that their timing is right. Again, its on them if a commercial gets cut short.

source: Studied video production in college, worked at a local TV station I'm not a carpenter. Was wondering if these would look better painted? What can I do with these door knobs? The plating or whatever is coming off. I bought new knobs. The holes in the door don't line up. If I hired a carpender, could he drill new holes or would this not work?
We had the same doors in aprevious house. They made the hallway dark, so we took them off thehinges, cleaned them, sanded them lightly and painted them white. We usedthe same hardware after cleaning all the knobs. We thought, buying newhardware would be too complicated as you find out. You can also adddesigns/stencils to the door or add trim to it. See also http://www.hometalk.com/diy/windows-doors/doors/door-facelift-4063911 some inspiration. Good luck.
@Liliana Wells Thank you. It sure made a difference in this door.
You could add some trimwork to jazz them up......
I have thought about that. Im not sure I'd like it. Was wondering if others would like that look.
If the new knobs don't fit the holes, I would return them to where you bought them. Remove one of the existing knobs and take it with you to size up for buying new. Once the doors are painted it won't matter if the knobs are the same type as you already have as they will look better as they are new and won't be all tarnished. I would paint white and try to go with a silver colour door knob rather than that gold/brassy colour. If you are adding trim to your doors, be careful if the doors are very lightweight and hollow. You don't want to wreck the doors bashing nails in. A strong glue might be better to hold on any wooden battens or trim that you might want to add to give the door some character. Ask in your hardware store as I don't know what brands they sell where you are.
@Carole Great ideas. Check out the rest of the posts. I'm going to paint the doors white. One post had a yellow door with white door knobs. Think I will paint or have the knobs and hardware painted white also.
spray paint the old hardware, return the new. Remove doors clean and paint white.
What color are u thinking?
@Rose, that's a personal choice. There are high quality metal finish spray paints in silver, brass/gold, and oil rubbed bronze.
@Z Later there is a post of a yellow door with white knobs. Thinking I'll paint doors and knobs/hardware white. It's only paint right?
@rose, do you just hate that they are flat or are you not liking the wood itself? As for the hardware, I'm with @Cathy, and would remove them to spray paint them. To protect them I'd advise using a few coats of spray on polyurethane too.
@Z I hate everything about them. They have no style. I thinking maybe it is also that there are so many doors in such a short hallway. Usually all the doors are open to make the space seem a little bigger. The hardware and doors are 60 years old and aren't in the best shape.
@The Chirping Frog WOW maybe a combo of all these ideas would be what would work great. A paintable wallpaper with trim around the outside. Paint it all white and spray all the hardware. I have 6 of these doors in a very short hallway. I have a doorway also that goes to the living room. It is the only natural light. Maybe I will just start with painting one door and its hardware at a time. Then I can better tell about the trim and wallpaper.
@AvonelleRed Thanks, that does look better than I thought it would.
I have the same doors and I thought about taking them off and retrofitting antique doors...not sure if I could find a match with the sizes though. Just a thought...
@Heather not sure I could find that many doors that match and they are 3 different sizes. I have a local place were I can check.
That was our solution. Doors were found curbside or at our town landfill (they put aside useful things). We collected and installed them over a period of a couple of years and returned our 1920's era interior to a more authentic look. It's a shame to waste those old doors - they're so well crafted.
@Dusty It's encouraging that someone else was able to accomplish what I was thinking! Thanks for sharing!
@Dianne Methner I think that I have decided to paint them. It will be quite a big project for me. There are six doors. Sigh It will take more measurements because only 3 of the doors are the same size. I thinking about paintable wallpaper inside the trim and painting it all white.
@Dianne Methner Thanks for the ideas and encouragement. I will get a low nap roller to use. I saw a tip that suggested using a lint roller on the paint roller before using it for the first time. I'll see if that works too.
My son just bought a house built in 1951. He replaced all the doorknobs & hinges. The doors had little holes for the doorknobs. So he ordered from Lowes a guide you clip on the door and drill out the bigger hole. Worked like a charm. I'm sorry I don't know exactly what it is called, but I'm sure a hardware store would know. He had brass type hardware & replaced it with brushed nickel.
Wow...this hits home. Our whole house has these types of doors/finish. I'm going to paint my bathroom in the next month and I have decided to, at least paint the one side, of the door that goes out into the hallway and paint the "closet door" that is inside the bathroom. on both sides. If that looks good then look out.......I hate painting but something has to be done to improve the look.
@Rose You absolutely hitting the head right on the nail...LOL....I'll try to do some before and afters.......but I won't be starting this project until AFTER the new year.
@Sofia Saraiva great job, it looks like you completely replaced the door.
I've painted and decorated these doors. They do need more paint to cover that ugly wood though!! The trim really dressed them up. We've moved in the meantime and I haven't talked hubby into doing the same thing here, though I did paint closet doors and one bedroom door.
@Djr2310 This will be a major project for me. Think I will paint them with KITZ first. Hope it doesn't take too many coats.
Whatever you decide post after pictures.... Can't wait to see what you come up with.
@The Chirping Frog I have so many projects to do. I am going to paint the hallway and the trim first. Probably won't start the door project until I can take them outside.
All my doors in my condo are like this. I painted all of them. Used Kilnz as a base because it covers so good. Then used paint made to paint cupboards. Not at home now so I don't have access to the name or brand. I got it at Home Depot or Lowes in the home remodeling section where you buy cupboards The Door knob problem I don't not know. Not quite sure what your problem is there. Didn't understand the post.
@Lucille T Thanks. I didn't know they made paint for cupboards. I'll check that out. Probably is a more durable.
Yes, painting is a great idea. You could give it a distressed look and you could either add a hook for different wreaths or add some words or be really artistic and draw and paint something.
I did all the doors and woodwork in my former house. It was amazing how great and light filled the areas were after. Would recommend doing one at a time, one side at a time. Clean really well as a first step. Put the door on saw horses. Tape around the hinges and