A 3 day travel card isn't the same as a 72 hour one

3 days means 3 calendar days so even if yiur first use is at 11.00 PM that is still Day 1.

so that would be say Monday, Tuesday and Wednesday.

a 72 hour pass is exactly that it ends 72 hours after your first use. So fro 11pm on Monday it would end we 22.59 on Thursday.