Without leash, he clears in 3:50. What's key is to space out the gaps you use your skills and your refreshed skills the moment you gain 5 ferocity, making sure to use all 3 seconds of the steroid you get from either Q or W.
Gank-wise, he's decent but his bola has a pathetic range. Once he hits lv 6, his ganks are slightly better because of the 7 second stealth and the leap range. Most ganks have to be really situational for his leap to work.
Dueling wise, he's a strong dueler and won't be easily counter-jungled in a direct confrontation unless you coordinate jungle ganks on him.