Question about buggy achievements (play/do this for x amount of time)

I'm playing a game, and I'm having great difficulty unlocking time based achievements (play 24 hours, play 48 hours, play 72 hours, play 168 hours).

Anyway, each achievement is taking over 200 hours to unlock (example: I just unlocked the 72 hour one after having played 291 hours.). I did the math, and the number of days between 72 hours and 168 hours is 4.

Would I get in trouble if I unlock the last of these achievements before the fourth day is up? While they've been unlocking in order, they seem to be unlocking at random.

You'll probably be fine because the achievements seem to be really buggy in the first place.