Depo Testosterone is Testosterone Cyponate, which is one of the longest-acting Test esters out there. I think the half-life is 9-10 days.
As far as dosing and frequency for HRT, my guess is the doc would try to give you 100 mg or so per week. IMO, insist on injections every week or you may be on a bit of a testosterone roller coaster -- two weeks is too infrequent. If he pushes-back on weekly injections, offer to self-administer them. It's a trivial shot.
Then, once you're self-administering a weekly injection, inisit on 200 mg/week. To counteract any bloat or possible conversion of the testosterone, also ask for a small dose of Arimidex (i.e. 0.5mg every other day).
If you're doing 200 mg/week, train like a madman, eat well and get good sleep you should see some amazing development. My first cycle ever was only 200 mg of cyponate per week and I loved it.