I like to use Humbrol thinner and Winsor and Newton oils for my washes and the thinner dries very quickly, overnight is plenty of time. I like this thinner because it is quite mild, evapourates quickly and I feel it has a lower surface tension and better capillary action than Turpenoid or Turps, this helps it run into all the recessed detail easier. Apparently Ronsonol lighter fluid is even better but I haven't tried it personally.
Cheers ...Snowy