Answer:
Yes,of course we can.
Explanation:
Of course we can use will after when because 1 when needs a past tense or present past tense and the word will is a past tense.
An example of this could be like...
When will the apocalypse end
When will you be able to eat vegetables.
I saw you the other day at the park and you said you didn't go ,and that really made me angry,when will you stop lying to me.
You probably here the last one alot when will you stop lying to me.
See your answer is yes.
Hope it helps have a great day:)
