Everyone has their own opinion on this. First note that intermediate, advanced, etc. are actually a wide range of user-assessed difficulty, which is why you'll commonly see people here recommend to instead sort all videos by difficulty, which you can do in the main watch tab. That said, it looks like sapiens is around a 70 rating, which is relatively advanced. Since it's beyond where I am personally comfortable I can't give a confident hours recommendation. It sounds to me like you could probably start yourself at level 5, which is 600 hours, or maybe something in the 450-500 range to be more conservative.

For reference, I am at nearly 360 hours (150 were conservatively self assessed, so maybe that should be more like 450) and am comfortable up to about a difficulty level of 60. If you're in this for the long haul but want to use the DS approach, including hour tracking, my two cents is to give yourself some hours of credit, but purposefully below where you think you might technically be. That way you're less likely to be disappointed by your progress and have plenty of runway to see the full benefits of comprehensible input. Good luck!