People are confused as to how to sit shiva and how to properly pay a shiva call. Because people do not know, and because talking about death makes people nervous and awkward, the shiva house often turns into a festive gathering filled with nervous chatter, instead of the proper house of mourning.
The average number of days in a month is around 30.4. With 24 hours in a day, this is an average of about 730 hours per month.
If you use that average to say how many weekdays there are in February you'd be off by almost two days since there will always 20 weekdays in Feb. In month with 31 days depending on the day of the week the month starts you could have as little as 21 days and as many as 23.