Good thread! I’m starting on a very similar routine as you and I’ve felt my body has been able to handle the stretches and it’s naturally taken me up to an hour of manual stretches so far. I build up going:
1min left down, straight down, right down, straight out
1:30 LD, SD, RD, SO
2:00 LD, SD, RD, SO
2:30 SD, SO (23 minutes total up to this point)
3:00 SD, SO
and I keep doing 3 minute reps of SD/SO until I reach the time I want.
One thing you might want to look into are JAI stretches at the end of your routine. They are very quick and easy to do and I think the gains from them are definitely significant, especially if you do manual stretching like you are doing first and get everything nice and lengthened. I do 90 SD/90 SO. I also took a lot of my info from marinera, firegoat as well. I do the extra downward stretches (left/right) from firegoat’s recommendation firegoat - Length Gains and I saw marinera always recommended both SO and SD so I keep doing those the longest. I feel like I get a different but good stretch from SO than I get from SD. Both are great though.
congrats on your gains, hoping to join you soon!