Okay, work something out in the appropriate thread.
Actually, Tintavius arrived in February, so Winter is out as far as making enchanted items. Aodhan can work on the mundane version, then mundane and Quality version. Rereading the mystery initiation rules, however, it doesn't look like it exactly lines up, since you can leave "as the end of the season draws near".
Say, spend the last month of Winter (after Tintavius arrives) and the first month of Spring working on those, then leaving in mid-April. Orbis shows that it would take a little over a month (32.7 days) to get to Verdi. This includes cutting overland north of the Pyrenees, for 8 days. It would probably take longer if he went around Iberia and through the Straits of Hercules, I'd have to sit down and figure out how much longer.
So, figure a month there, a month back, so he'd probably get back in late June or July, likely in time for the Loch Leglean Tribunal.
Verdi probably has some pretty good Philosophae books, being the Domus Magnus (at least for now?). So, probably upwards of 5 pawns for an average book there? (I'm leaning toward doing a 1 pawn per 5 build points of book)