Average hours per day (American Time Use Survey) This term refers to the average number of hours spent in a 24-hour day (between 4 a.m. on the diary day and 4 a.m. on the interview day) doing a specified activity.
Usually a cats first season is somewhere between 4 and 10 months old with average age around six months. Siamese and Burmese cats are quite precocious and will often have their first season at 4 months of age.
Being in heat for a long time can be boring to a cat. Cats are seasonal breeders, which basically means, they can go in heat only if the daylight is present for more than 12 hours. Normally, this means cats can go in heat for a period of six months between early spring and early autumn in the most part of the world.