In Adventurer's League, can a wizard learn spells from another wizard in the same group?
In that case would the downtime days should be subtracted from both of the wizards involved?
This can be found at the bottom of page 6, into page 7 of the DDAL FAQs
This equates to 4 levels of spells per downtime day:
For each level of the spell, the process takes 2 hours and costs 50 gp.
Note: both the wizard doing the copying and the wizard with the spellbook being copied must expend downtime days.