This one you'll need to employ some different strategies compared to LSWII if you want that 100,000 studs. Hoth Battle is NOT a good choice for studs anymore, at most you can get 20,000 in a standard run if you don't pick up Power-ups. It's just not worth hanging around here. Echo Base becomes a key stud source, as well as Falcon Flight which while not as good as LSWII, can still help pick up studs. Any remaining studs should be picked up along the way, Betrayal Over Bespin is a nice source on studs if you're running low once you get there. Time-wise, most of Empire is pretty average in length. No level stands out as long besides Cloud City Trap, and the only reason is the amount of Vader fights there are, but you'll be fine if you finish Trap with 40 minutes on the clock.
Location: Bespin
Time Limit: 5 Minutes
This one can be quite difficult. Boba is still the go-to character for this. Bespin is a lot like Geonosis in that the area itself is quite narrow and it's easy to lose track of where things are and lose studs and Power-ups over the edge. In general, stay away from the left side, there isn't anything breakable and it's not worth it. The bridges between the areas hold objects, and there's the occasional metal object sitting around the place. Take your time, and try to attack enemies on the larger circles instead of the passages. Power-ups are very useful as always. Grab them whenever you can.
Location: Hoth
Time Limit: 5 Minutes
5 Minutes instead of 6 huh? Alright then. This one can be annoying because of the lack of objects strewn around the arena. Hoth is also a smaller space than the other ones so far besides maybe Kashyyyk. Overall though, it's not too bad. Don't bother with the metal barriers (not metal trees in TCS), that's just a bad idea. Everything else though, go nuts, as the metal trees have also been removed and changed to standard trees. There is only one torpedo tower here, but it's useful, as it will always give a Power-up, so use it whenever you can.