It's going to vary widely, The other tires and riders may not get what you get. It's typical to have to check bike tires before every ride. The smaller tires with high pressure will tend to lose more air in a day.
On a pair of soft race tires I wore them out completely in 800 miles. I have some harder touring tires that I rode 5600 miles and the thread started coming off the tape over the bead, but there is plenty of tread left.