The tough work here will be getting to 100,000 studs due to Episode II having three short stages! Getting under one hour, however, will be easy peasy, there are no real long levels in Episode II! Unlike LSWII, Vehicle Stages are not always good sources of studs, they simply don't drop studs like they did in LSWII, although for Episode II they work well. You can get some nice studs from the force field areas in Bounty Hunter Pursuit and the Techno Union part of Gunship Cavalry due to those areas being enclosed spaces, but Discovery on Kamino is easily the best choice to get a lot of studs. Use the rest of the levels to scoop up any remaining studs.
Location: Geonosis
Time Limit: 5 Minutes
Welcome to the Geonosian Droid Factory! This is not a particularly large area, and the corridors are quite tight and have no barriers. It is quite common to see your studs and Power-Ups fall off the side and into the abyss below. So, this one will likely take a bit longer to complete, but the same rules still apply. Keep moving, keep shooting, and those studs will come to you sooner rather than later.
Location: Coruscant
Time Limit: 5 Minutes
Now this is a step up in challenge compared to Episode I! Coruscant doesn't give us a very large area to deal with, and while your maneuverability is great, the objects to destroy are largely kept to the rooftops, so you are rather limited on how much you can properly use the area. Torpedos aren't overly useful here, there's only one tower and it's smack in the middle. You'll likely loop around shooting and collecting things with a Power-Up in hand, so as always, keep moving!