Rough order of magnitude = one hour per 1000 s.f.
No hard/fast rules on that as it can vary depending upon condition of home.
I usually have notebook with me and enter notes directly to report as well as plenty of JPGs. Finish up report back at office while adding representative JPGs and review for errors, presentation and a 2nd or 3rd review of notes/images to try and be sure all bases are covered.
My office is not as exotic as Rick's.
