When I first started i built a rack that would stack 5 screens flat spaced about a couple inches apart No Matter how many i had coated 1 or 5 they dried in about 2 hours with a cheap box fan set on low blowing air over them..
except in the winter when it got cold in back..... I now have a forced air heated drying cabnet but still use the simple wood rack when im only coating one or two screens...because its cheaper on the light bill then the heated box... Total investment ...half a sheet of plywood and a couple 2 by 2's...
If you coat the screen with a thin layer of emulsion and use a fan dry it, then it should only take up to 2 hours. I have done a sceen in as little as 1 hour.
We inserted a normal hair dryer into the bottom of our drying cupboard. Keep an eye on it - it usually dries all the screens in an hour as long as you have warm air circulation.
drying time for emulsion 
