I don't have personal experience from MediCann. The only info I have them is purely by hearsay. I hear that they are lenient as far as writing recommendation's for MMJ patients. What I also hear is they won't back you up in court if you get in trouble by the law (unlike the other doctors, like the ones on the CANORML site, for instance).

The doctor's recommendation is good for up to a year. Some doctors will give a restriction like, a 3 month or 6 month rec, and they may extend it if you see a specialist/therapist or whatnot. My rec is good for a year, and I'll have to go back to the doctor and get it renewed next April.