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I'm currently skim coating some really bad looking walls and my 45 minute joint compound is setting too fast for me to get a nice finish.

Can I mix the remainder of my 45 minute Joint Compound with a new bag of 210 minute JC to get something in-between?

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The short answer is yes. I have done this but not for the reasons you have stated. I just had some leftovers and wanted to use them. As long as your mixing agent - water - is the same then mix away. Note that other than trial and error you are looking at a setting time between 45 mins to 210 mins - even if you mixed 50/50.

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Great, thanks! I am mixing also because I have leftovers, but I was hoping for a slightly shorter drying time as well. –  Alex Moore Apr 16 '13 at 17:27
    
There are 'kickers' and retarders for the 'hot' JC dry mixes. You have to go to a drywall supplies to find them. –  HerrBag Apr 16 '13 at 22:25
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