I actually didn't have time to wait (I'm also one of the Dutch people and it's almost midnight here).
So I went ahead played here as an elder.
Dickie de Groot finished her challenge on Friday 21:01. According to the game, she had lived 86 days, but actually, it was week 4 (the same week she aged up to adult and elder), so it should be 38221 minutes.
I hope it's not a problem that I didn't use the cheat - it does make the calculation of time a bit trickier.