No you will always run out of time (yes there is time the red wisps are your time) when they all disappear guess what fighting time!!!! So you need at least 2 or everyone will have to do the clams.\
The waterworks clams require 3 young wizards. I made a hypothesis about this.
*Hypothesis: How many wizards do you need for the clams? *Experiment: 2 Young Wizards trying to succeed. *Result: Failure.
I'm sorry, but you will need 75% of your team for the clams to all open. The timer is very short.
Which explains why it's such a hard tower!
This isn't accurate. I've done Water Works with one other wizard. He and I have a system and we've never had an issue. You just need to know what you're doing and do it fast. :-)