You do "biz dev, sales, IT, product development" and you're an investor? How do you manage all of these things efficiently without dropping the ball?
The short answer is: Not always perfectly.
The slightly longer answer is: It's a trial and error kind of thing. My roles within WeWork over the years have typically not been in parrael but in series. I ran business development followed by IT, product development, sales and finally M&A. Throughout that time (5.5 years) these overlapped very little.
Investing is something newer for me. As of a couple of months ago I decided to go all in on investing full time. Before that it probably only took up about 10-15% of my time (my weeks typically consisted of 70-80 hours worth of work and meetings. The hardest part comes post-investment. Once you've agreed to put your money and time into someone else's dream, you have to really commit and support them for a long time. It's not always easy but I just try to prioritize and re-prioritize each and every day.