Although moderators go by a queue of maps and there are 30+ before yours, you can still get your map approved quickly if a reviewer reviews it (professionally). It's all about attraction. If your map has a good description and first impression, it's likely you'll get a review.
Hail leaks.But sadly, that's not working in spell section. You must submit leakful non-MUI spell to get fast moderation *cough* rejection *cough*
If it's a hyped map, 1-2 days max. Otherwise I'd say a week. Depends on the map review group. (partly)
Befriend a map mod then ask him to review it. And if you took the relationship to another level then you might get some extra points.
Just don't upload one of those "nArut0 ultimate gathering arena maps" or whatchamacallit shippudden shenanigans onmyour map section, its bombarding my pretty eyes.