We have had some debate about the duration of Shroud of Invisibility (Recharge 6) during non-combat Encounter mode.
During combat mode the recharge is clear. No problem!
But our Grey Wizard likes to use the spell in non-combat encounter or when the chapter is open-ended (as in Chapter 2 in An Eye for An Eye). For instance, is the duration of the spell long enough to (1) walk pass some guards at a gatehouse to a small fortress; (2) walk around unseen to locate a specific item; (3) steal the item; (4) walk to the gatehouse unseen; and (5) pass the guards again. The act can be split into five rounds, which is within the recharge value of the spell, but the duration of the spell is then so very much longer than during combat mode. The player likes to known how often he potentially should cast the spell before he starts casting it.
What are your experiences with similar situations?