Tough to really give a "blanket" answer to you dilemma, insasmuch as you didn't say whether or not the guy has an AMEL with instr. privileges or not, how much AMEL time he has, how much MEI time you have, especially in C-340's, the part of the country you live in, etc. Having given several thousand checkrides though,and if you're an experienced MEI , I wouldn't give my timeaway in a C-340 for anything less than$150/hr.I had an electrician at my house last week-end and he charged me $99/hr., portal to portal! Here's the bottom line though, if you think the guy is a jerk, don't even bother with him as there is too much of a chance for the "halo effect" to seep in and potentially taint the training. Good luck"