Well that answers my question, I had wondered how many you could stack still get an effect.I made one with like, 64 stacked. I was going up for 5 minutes.
I'm currently look for a new means of traveling short and large distances...
Arcane levitators are great, and they're stackable, too. Each extra one you place underneath the first adds another 10 blocks to the height they will raise you to. I've stacked 4 of them before, but I'm not aware of an upper limit.