How many flips before hiring help?

[Jackson Tate]

I am about to be managing two different fix and flip projects by myself while still working a full time, 40-50 hour a week job. It doesn't seem like it's going to be too difficult, especially with both homes being within 10 minutes of each other. I want to continue scaling the business to the point where I have multiple projects going at one time. At what point did you find it necessary to hire help in order to keep each project running efficiently, especially while you are still working a full time job?