1.5 hours is probably about the max table time for this game to stay enjoyable. Here is how we do it.
1.) Only play two players
2.) You only need to defeat one boss before visiting Dr. Wily's castle.
3.) The yellow devil spot in the castle is a checkpoint. If you lose your third life in the castle and have reached this space, you start over here.
4.) The yellow devil spot is also a boss battle selected by picking a random boss card. This is how you can get at least a second power before battling Dr. Wily.
5.) Don't flip over the Dr. Wily boss card. Once you beat it once, you have won the game.
That's it! Got this game on clearance and have been enjoying it. Picked up most of the expansions.