Diving/surfacing, emergency surfacing, and crash diving vlaues can be found in the ballast section of the merged gr2 and sim files of the sub, default is 10000 litres/min?(not entirely sure if thats the right rate, may be soemthing else, premise is the same) for normal and 100000 for emergency surface and crash, to raise the time needed, lower the numbers. go here for a quick and dirty method of using goblin editor
http://www.subsim.com/radioroom/showthread.php?t=165805