Li Shenron
Legend
Razz0putin said:1. what do all of the other players do while that's going on
2. it's what the character can do not his stuff that the story is supposed to be about.
so just wondering how do you guys resolve these points
1. I don't understand what's your problem... if it takes 400 days to the Wizard, how long does it take the players? A few minutes I guess, why is it boring for the others? Or do you mean it's boring for the characters? But who cares?

What about just saying that characters are going on with their lives in the meantime: for the fighter it includes practicing, for the rogue it may include some mundane adventuring (easy stuff, no xp), for the cleric it's church administration. IMO adventuring is still a minority of the time spent by characters.
If it help, what about saying that in the downtime everyone is learning his next feats/skills/spells/etc.? It's wrong to think that a PC goes adventuring, puts some xp in the backpack, then goes home take the xp out and paff! the xp turn into a new feat.
Try to imagine that everything "new" or "better" you get at level X doesn't happen in one instant, but it is the result of what you've been studying/practicing/etc during the previous level, and suddenly your characters have a very busy time during downtime.
The key point is that you don't have to roleplay or even mention this all the time.
2. I absolutely agree. At least however the item creation thing are still much better than buying magic items from this point of view. It's still "their stuff" by at least it's made by them personally instead of bought, which makes it part of themselves in a way.