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.
The Jewish (lunisolar) calendar has alternating months of 29 and 30 days, and the average length will always be around 29.5 days even when a 13th month is added to the year. The Islamic (lunar) calendar also uses alternating 29 and 30 days for the month but without varying the length of the year, giving an average length of 29.5 days.