It took 5 or 6 tranq darts with a normal longneck rifle for a level 5. It also took around 375 narcotics. It took 2 hours and 30 minutes to take. I fed it around 90 citronal. So be prepared to babysit it because it's torpor goes down 3 every half a second. And I get about 40 wood per tree with him though. But I would not recommend trying to tame this creature if you are not a level 50.
Not sure if this will help anyone but if you built a platform and two walls up (I used thatch) and out a ladder so you can climb up then shoot it with tranc arrows and if you have enough it’ll eventually knock out but they wake up very fast so make sure to have enough narcotics,narcos, or bio