Crashem is right on. In theory, a 1/10C rate for 10hrs gives you a full charge. But things aren't 100% efficient, so you usually take 12hrs at 1/10C to account for energy lost as heat, etc.

10C will toast off most batteries used for TX and RX packs. There are some high current nicads used for the larger motor packs that might handle that rate, but the AA size cells in your TX won't.

As for memory in your TX pack, don't worry about it. It's a non-issue. Especially since just about every TX these days has a meter right on the front to tell you what's going on. Just charge it up and go fly.

On the RX side, memory is also pretty much a non-issue. You're more likely to damage a cell in a dozen other ways, causing the capacity to go down than you are to actually see measureable "memory". But if you want to cycle your pack, you can just leave it on and wiggle the sticks for a while.

By the way, you don't want to discharge the pack below 1.1v per cell on a regular basis. Once in a while, when you accidentally leave things on over night may or may not be a problem, but don't do it regularlly.