I'll give Moanhinho until halfway through next season before Levy sacks him:
1) His brand of football fits Spurs about as well as it did Man Utd. Heavily defensive 'park the bus' and overly reliant set pieces was never Utd's style, nor does it fit in with the expansive play that spurs have historically offered.
2) Levy simply will not fund a manager that seeks to bludgeon the EPL with big player spending then disappear after two seasons. Mourinho won't get the backing in the transfer windows he's been used to at Utd/Madrid/Chelsea.