We also have about 15 acres of plots. Spraying took 6 hours, one guy on tractor, another carrying water.

This year I tilled 6 fields that were about 5 acres in about 6 hours. These were established fields in central Al (good dirt, no rocks) all but one had been sprayed but not cut. The one not sprayed had green growth over 6' tall which was no problem for the tiller. One pass and they look awesome.

Another guy disced 8 fields about 9 acres in about 8 hours. He made 3 passes in most fields and they still didn't look as good as the tiller.

All the seed was covered with the tiller set very shallow. Not sure on hours there, but I'd estimate 12 for covering.