Once in a while but I cant put up numbers on how many times on a particular day because it depends on if there are hanging positions ive been rechecking on.
When I'm on PC then I do check with CMC and preev with btc and alts prices.When I'm on mobile I do make use of blockfolio and other related track apps.
I estimate when I'm mobile when it comes to checking it would be 10-15x per day.