How can we keep the crisp part of French Fries for longer time?
I am no expert but I recently moved to a student apartment in the Netherlands and my roommates have some experience making fries.

I'd say one of the main factor that makes the fries get soggy is the steam that comes out of them. If all of the fries are very close together, like in a bowl, the fries will basically steam themselves. To prevent this try to spread them out as much as possible. What we usually do is put the in an oven tray (with parchment paper) and season them.