Better to be wrong that way around. I remember missing out on some games because I thought a sale lasted another 4 days when it was really 4 hours.
And of course it's now that time of year when you're terrified of buying a game just in case it turns out to be the next free "mystery game".
Edit: And I was hoping to have a go on Pillars Of Eternity last night but once again they're slow to appear on GFN. Everyone seems to be obsessing over that Cyberpunk thing over there so I'll have to wait.