Its before the evening peak of flights arriving from Australia and Japan - so should be fairly good.
But with the constant stream of LCC its always hard to judge.
I have tried to work it out by checking the arrivals a week before - so you get the correct schedule, and arrived expecting a heaving mess - only to find a few people in the immigration line up from the previous flight and thru in just a few minutes.
I have heard the VIP is suspended at the moment, not sure if it was due to Jokowi innauguration today or some other even taking place in Bali -but I bet its back working in a few days, its a great money earner - and I am sure all the Immigrasi workers are getting a cut of it.
I believe it is why the lines are so slow - the slower the lines the more people pay for the service, the more they all earn
Same same but different - in Asia - thats how it works