To walk from one end of Terminal 1 to the other end of Terminal 2 takes about 10 minutes. You will have to reclear security as I am not aware of an airside link. (Oops, for future searchers, there is an airside link between Terminal 1 and Terminal 2 upstairs.) I am not sure about the passport control and customs requirements, but it should not take more than 20 minutes; more likely closer to 10. Do not have enough experience with the security lines at that hour, but I think that you should be comfortable making your connection.