On Tisha baAv you can't
eat
wash oneself
anoint oneself
marital relation
wearing leather shoes
sit on a chair
Torah study
greeting people with a blessing
conducting business
going on a pleasure trip. etc.
So my question is, what are you supposed (or what do people) do for 1425 Hours or so. Besides maybe 3-5 hours of davening. So now we have 10 Hours and 8-9 hours of sleep coming out to about 13 hours of...