Hi
For what it's worth here is our experience.
Yvonne and the kids were very keen to see the monkeys so we decided to go up on the cable car to see them.
Yvonne is not scared of heights but did not like the cable cars one bit.
The cost for us was approx £70 and the visit broke down as follows.
Cable car up 5 mins
3 minutes Photographing monkeys from a far after one went crazy for a bag of cheese puffs a mother thought would be the ideal time and location to give to her toddler(seriously they warn you a million times from the minute you join the q in every possible language

)
2 minutes trying to see Africa from the viewing point through the mist (we didn't see it

)
5 minutes photographing the ship (the most fun bit)
5 minutes trying to coax my daughter past a big bad monkey on the wall so we could get to the exit she wouldn't go past it and we were not going back for her
10 seconds pondering if we should stay longer to get our money's worth
2 minutes plucking up the courage to get back on cable car or to just jump down the rock instead
5 minutes in cable car back down.
Honestly that is about how long we spent an how it actually went, if it is something you have long wanted to do then you should go and do it and will love it, if only doing it as something to do while in port I cannot honestly recommend it from our experience.
One thing for sure though it's dolphins all the way for us this time
Col