Space Mountain took 12 hours to clear. It came following the Pizza Planet/Spanish Buzz quests.
Yep. Plus, there is still the second set of Monster Inc. characters, the Wall-E duo, and the Tangled set, so there might still be more Gem characters. I purchased the $3.99 Pluto pack, so I have him already.
I understand that it can be frustrating, but it's also a free game. We can still progress throughout the game and quests without the extra characters. But those that use money will be able to get more characters and progress faster. I'll admit I'm likely going to get Rex and Boo at some point. We should also remember that if nobody bought gems, then this game wouldn't last long. The money made through purchases help them continue the game, expand it, and give us more content.