Originally Posted by eLefAdEr

Depends on how fast you can click. The moment the deal starts (there is a countdown timer for each one), get that click in.

Last year, the most popular games were 100% claimed in under a minute. There is a waitlist function as well, so if someone claims the deal but doesn't check out within 15 minutes, that copy gets removed from their cart and goes to the next account in the waitlist, where the 15 minute timer starts for them.