I don't know about giving the unearned levels it is nice to actually do the things to earn them. But taking downtime and advancing the story timeline can be fun and allow for some things that maybe not get to happen if you didn't have the time jump.
There are other things you can give the players other than levels. Maybe the mages have new spells or do items. The fighter types learned a new techingue of fighting so you give them an extra feat.
Items, extra feat or skill points, wealth can all be used as rewards.
There are other things you can give the players other than levels. Maybe the mages have new spells or do items. The fighter types learned a new techingue of fighting so you give them an extra feat.
Items, extra feat or skill points, wealth can all be used as rewards.