Usually about 2 boat lengths +/-, that's roughly 40' X 30 traps = about 1200' total or as much as a recreational trotline.
The boat goes into neutral every trap.
If the crabs are concentrated there will be two rows, or as close as I can get to that, of 15 traps or sometimes even 3 rows of 10.
Alot of it has to do with how much room there is to begin with.
Early bird gets the worm and the others encroach.
"The Chesapeake does not impress those who know it best as the grandest or most of anything. For all its size and gross statistics, it is an intimate place where land and water intertwine in infinite varities of mood and pattern."
William W. Warner "Beautiful Swimmers"