it really depends how things are going but i have done stuff from start to finish in 45 minutes before (two of my biggest selling things they were as well :D ) but usually it takes me 3-6 hours to do a track with the more complex melodic detroity sounding stuff taking the longest. im definatly in agreement with mr drummer on the theory it's better to get it finished then to constantly tweek it over and over and i virtually never remaster it once the track is finished , think i have only done that maybe 5 or 6 times.