This is a fun one to finish off the Prequel Super Stories. Time-wise, finishing in under an hour shouldn't be a problem. All the stages here are of a decent length (besides Grievous, which is short) so finishing in under an hour should be no problem. Getting 100,000 studs also isn't overly difficult. Battle Over Coruscant is not like other Vehicles stages in the game, being on-rails instead of free-control. However, it is so easy to rack up studs that it's not surprising to have pretty much the entire 100,000 from this level alone. Darth Vader is also a nice level for studs. Lots of Blues to pick up in the finale of the Prequel Trilogy. Other studs can be mopped up throughout the other stages if needed.
Location: Mustafar
Time Limit: 5 Minutes
This is not a hard Character Bonus. While the lavaflows of Mustafar might seem daunting at first, there are a lot of Purple Studs to go around here. Simply destroy stuff, find a Power-Up, and go nuts. Especially grab those Purples with a Power-Up in hand. A couple of structures here will disappear into the lava after using them, but you have more than enough time to grab the goodies before these structures disappear. Not a problem.
Location: Kashyyyk
Time Limit: 5 Minutes
This one initially looks daunting due to a similar look and feel to Endor in Episode VI, but this one is much nicer. There are three torpedo towers here so infinite torpedos are your friend! They will always give a Power-Up every time they are destroyed! Otherwise continuously roam, and mop up the studs needed.