And how do you propose to do that when the clocks arent synchronized? Clock drift is exceptionally common. Not everyone runs ntp or ptp. Probably even fewer use ptp. Desktop/laptop clients it's typically configurable on whether or not to attempt clock sync, and ive never seen where the level of synchronization is documented for PCs. High precision ptp usually requires very expensive hardware, not something to be expected of home users or even a startup depending on the industry.
The point was you could do similarly here. Just have a margin of like 30 seconds (or whatever). I never said you have to do this to nanosecond precision.
