Suggestions for implementing pumping?

Hey guys,
I just started pumping a little over 3 weeks ago. So far, I’ve worked up to 15 minutes inside the tube at 3-4” Hg (mostly 3.5). My current routine is this :
- warm up using an IR lamp for 8-10 minutes, then using a space heater for constant heat throughout the routine.
- 8 minutes of jelqing
- 15 minutes of pumping at 3-4” Hg
- 10 jelqs followed by a Uli, 5 times
- 10 minutes of edging

For those who’ve had girth gains from pumping, should I work up to 20 minutes inside the tube or rather spread that over two sets of 10 minutes so I can also get some pumping done after the Ulis?