13 hours - ouch!
The timber is only capable of showing a certain sized dot, and the black char grows a bit due to wood’s organic nature.
I find in the finest woods, 250 dpi is plenty, and sometimes even coarser is quite good, eg 150 dpi.
We do a lot of lazy susans in 16" dia, and from start to end is 48 minutes, covering most of the area. But that’s with a 100 watt CO2 system, cutting at about 260 mm/sec.