How long do clearances usually last for??

A lot of the time, items go quickly but if there are a lot, they go to clearance and then price drops from there til the items are gone. I have seen thibgs go in a day and others be there a month later.

It verrys sometimes a week sometimes longer

It depends on the merchandise. Clothing last longer than some seasonal products.

Not sure

Till they are all gone

Don't know

Usually two weeks.