Here's a good starting point for 135 rest regs.

https://www.nbaa.org/ops/part135/Ore...rpretation.pdf

Also, the Masterson Interpretation is a good read. You'll find it at the FAA database.

" a flightcrew member's rest period must be "(1) continuous, (2)
determined prospectively (i.e., known in advance), and (3) free from all restraint by the
certificate holder, including freedom from work or the present responsibility for work should
the occasion arise."
All 3 conditions must be met, these 24 hour "rolling rest" cases are all illegal, and mostly used by scumbag operators.