some tips I've found useful...
1.) block in your minis...just get a base coat for all of the main areas of the mini before going in and adding detail...this gives you the ability to field the mini in a pinch, even though the paint job may not be up to snuff with the rest of your force...
2.) as the Veezer said, have 2 or more types of squads/individuals on your table to paint...breaks the monotony...
3.) a nice comfy seat...ergonomics are important, just to save your back (I'm there with the getting old)...
I usually try to make sure I get one specific thing done per session, and if I get that done, then I move onto something else...makes it look like you're making progress...
B...