I've done a BFR for another CFI that took 2 ground sessions of 2 hrs apiece and 2 flights of about 1.5 apiece. Weekend warriors are always the most difficult because of their typical lack of recency and proficiency. My advice- don't do BFRs. When I get a request for a BFR I suggest the person complete some courses on the FAAs Wings program. After they've done a few courses I'll go fly with them on a fairly typical BFR type flight. After that I sign into Wings and verify I've flown with the person and the FAA issues the sign off. I'm not very comfortable placing my Herby Hancock in someone's logbook after only a flight or two, but as long as the wings requirements are met the FAA will issue the endorsement. BFRs can be tricky. Some pilots do great and others not so much. Don't get all bummed that the guy got annoyed. He obviously doesn't understand the liability involved on the part of the CFI. He's probably used to just flying his old CFI buddy to lunch and getting a sign off. Just remember that there are no FAA requirements on what is covered during a BFR, just that we do at least one hour ground and one hour of flight. The guy is probably used to something a little different. A new CFI is probably going to give the most difficult BFR because you require a little more convincing than an experienced CFI. That doesn't mean, however, that you shouldn't give BFRs. Just be fair.