It's 1 hour mostly, sometimes 90 minutes—for every game. Following is ~6 months old as I'm no longer a Club member, but: If you join the 'Club' for $7/month, you get a good discount on all games, plus a free game every month.
There are also daily and weekly deals on one title for $3. I've been a member for over a decade and it's worked flawlessly in that time. The main
PC games they put out are Hidden Object, that's at least 50% of their catalog I would guess.
Caveats:
1. They're
owned by an Australian maker of gambling machines.
2. They've let about 2/3 of staff go since 2018.