From Day #1.
To run a successful business you need one thing more than all others.
No matter what you do, the overload in this area is amazing. You can do the work on your own only for so long before you get burned out.
Let's go through a few examples:
Video Marketing - let's say you want to become known in a particular farm area. So you decided to create a video blog post about EVERY new home that comes up for sale and give your thoughts on it. Even if you don't even film the homes on-site but simply tour them, take pictures, then come back to the office and give a commentary then cut in pictures of the home in post so people can see what you're talking about, the work load is crazy. Some days you'll only need to make 1 video and other days 5. You need a full-time video guy.
Expired/FSBO Calling/Follow-Up - you can only call so many people in a day. Consistency in touching these people is the key to getting them signed up over time. So even if you call them and then put them on a list to mail to every other week for a full year, you might be mailing to 1,200 people at any given time. That's 600 pieces of PERSONALIZED mail that need to go out each week along with managing the list so you pull people out who have dropped off or have signed with other people. Again, that needs another person.
Nursing Deals - everyone has to nurse the deals they have to closing. Just taking care of all the detail to close 5 or 6 deals per month means that to do it without dropping any of the balls you have in the air you need another person's help.
Only those who hope to luck into a handful of deals each year sourced from friends and family envision a life without at least one other team member.