Rewind Tank processing usually triples the amount of time for each solution. This is based on a number of transfers from one spool to the other in the tank, wound so that each transfer or pass averages 1 minute. If you are only going to process a short roll such as 25ft/30ft Double 8mm, you can wind this smaller amount much quicker and thus can do a pass from one reel to the other in less than 30 seconds quite easily. This means you can shorten the rewind processing time, if using the recommended time of 2 cranks per second, to half the rewind normal time, which would be double the spiral reel time or thereabouts. However, a 25ft roll will transfer in a pass quite rapidly, and could be done in a span of 15 seconds. Doing this, would allow you to process a given single roll at virtually the same times as in a spiral reel or other full immersion method process. Your hands will get tired of course. Make sure to first prewash the film at 100 F to 104 F first for about 2 to 5 minutes, which will heat up the tank and film etc to temp. Make sure to be generous in your washes between chemical steps as well. Good luck and have fun!