I would fill the charcoal basket (or what ever you put charcoal in) and disperse your wood chunks under a layer or so, then take out about 12-15 briqs and light them, when they are lit put them back from where you took them (center works) leave the door open for a few minutes. Once you close the door watch your temps start to come up, once your temp gets close to your target start closeing your intakes a little at a time (don't try to choke it back down) leave your exhaust wide open and when it is where you want it (close is ok) and you get sweet blue smoke you are good to go!
As for how long only one way to find out is to do the above and time it, to see how long it will go at temp. Good luck!
A bunch of Webers, a UDS and a Happy Cooker!