The answer is relative to you personally. Whether it’s 30s, 3 minutes or 13 minutes, depends on your reaction. Whether it’s 1 cycle or 3, up to your needs.
Every single person on this forum and the lurkers, are all uniquely different. We might all share similar operating system, but the softwares are relatively unique to yourself.
Therefore, the only accurate answer is to figure it out yourself by experimenting, following your intuition and your experience with your own self.
15 minutes of Sanguine is nothing like 15 minutes of DR, or any other title. How anyone reacts is personal. Some can listen to full loops of Love Bombs other recon in a microloop.
Since you’re not getting any negative effects, then keep increasing until you get one, whatever shape or form it comes at you.
1 cycle is a minimum, more for a deeper clearing if you need. You can always return to Stage 1 later or continue until you finish the whole program, then run New Game+ and start your second playthrough. You can also pick and choose whichever stage you think you need.