That would be 100 minutes exactly, using full enhanced routine at max recommended times, and not a minute more, and this would only be one sitting. Note that SBP can be up to 20 minutes. These would be standard numbers, while in practice they will not look like this since some will inevitably be longer (ex. Navi kriya), while others could be much shorter. Then there's retreat schedules where you can do 3 or maybe more rounds per day, plus other elements (bhakti, diet, grounding, exercise, etc.).
A very compact routine would be only 30 minutes, and include abbreviated asanas, SBP, spinal bastrika, DM, samyama, YMK, NK, and cosmic samyama.
One session per day to me has varied from 50 to 120 minutes, with a comfortable standard as around 70-90 minutes x2 per day. Timing has always been an issue here, and days tend to be short, so as you can see it's an ongoing work in progress. As long as the basic practices are in place, and the routine is ongoing steadily, the adjustments can be refreshing and a good learning experience.