One thing that often disrupts momentum and really shouldn't is competitors.
If someone is difficult to talk to, if someone cannot communicate clearly, it's a real problem in terms of their likelihood to work out.
You're either not hiring at all or it's probably your single biggest block of time.
Most things are not as risky as they seem.
... how much time you should be spending on hiring? The answer is 0 or 25 percent.
A small communication breakdown is enough for everyone to be working on slightly different things. And then you loose focus.