my general guideline is for every time you queeze the trigger, its going to cost you about 7 mins of processing time, including downloading pics from your CF, PP, saving changes, burning to disc and/ or emailing resized pics for preview. unless you're a bo-chap "point and shoot direct to yahoo albums" kinda guy.
for me, if i am doing ROM assignments, a typical ROM assignment will take about 2 hours. here or there. i will normally shoot about 300 plus pictures. when reach home, will download to computer, basic minimal editing which includes changing of colours and exposure edits. nothing too fancy on PS. as i am not required to do that...
most probably take up another hour ba.
for AD assignments longer because got more photos to look through and filter out the good ones and some will have to go through PS to enhance effects.
but if editing on PS is concerned i believe it is going to take up much more time.