My brother in law has been hanging drywall for 25 years. I bounced this off him. He wondered if it was a warehouse application and if there was a lot of cutting at the ceiling line to accomodate roof trusses and mechanical stuff.Teetorbilt said:
He thought (2) techs and (2) laborers could hang it from ladders in a 40 hour week. Hang the boards vertical with a 12' board at the bottom.
Hope this was some help.