Some of its a tad small, but doable, yer right in the park of 2 plus loads Depending those first 18 getting 2 logs per tree... Hard to tell without boots on the ground.
I've done one load jobs, and half load jobs (though the half load jobs just aren't worth moving the machine in). Part timing like me could have all trees down and out in 3 weeks or so, Full time folks could probably get it done in a week or so, less if there is room to move.
Getting the mobile gone would be priority one, if you plan on hiring out the logging, the less crud in the way the easier it is for the logger, the more money you stand to make in the end.
The smaller 10" dbh trees may or may not end up as fire wood, or pulp, but from the sounds of it the rest has at least some potential