I am 100% confident shooting on my own; however, I can never be in two places at once. Having a second shooter is like having insurance, less moments missed.
It will vary every single time!
For weddings, it depends on your coverage but you can expect 600-1200.
For family sessions, 75+.
For couples, 100-150.
For couple and family sessions, 2-4 weeks.
For weddings, 6-8 weeks. (8-10 weeks during busy season!)