@Trevor Deeter - learn to walk before you run, learn to float in the water before you jump into the ocean..
I don't know what your past construction experience is (or if you're handy at all) but if it's minimal, then I would stick to rehabs first (doing cosmetic renos, then more complicated as you aquire and rehab) then go into new construction. I've full gut renovated several homes and did cosmetic reno in another few, so by now, I do know how to build a home. However I'm not running out to do new construction.. that's just me though.
Your questions from above and my answers/thoughts below:
First off... is this too ambitious for first-timers? yes I think so (unless you have construction experience yourself).. would focus on renovations, cosmetics first.. then go into development.
In general, how much of your time as an investor is spent enmeshed in the renovation process once it has started? I act as the GC on my projects so I'm usually purchasing and dropping off materials at various points during the week, speaking with my subs/contractor on the phone for progress/updates, etc. Avg 10hrs/week easy. Plus if I'm doing online research/purchasing material online.. add another 10 hours/week on top of that. As the project goes on and more gets done, I stop by/check in less as larger work is going on and takes time.
Aren't we just planning with our GCs and then our GCs handle most of the grunt work during the reno phase? IF you're hands off and have a GC running the "whole show" as to say, then still expect to stop by and check on progress at least weekly (e.g. Fridays). Preferably twice weekly. The more you trust your GC, less likely you have to stop by
Other than my wife and I checking in on our GCs, what type of work load should we be prepared for in this phase?
--Depends on how 'hands on' vs 'hands off' you want to or "have to" be with the project. Again, if you have a great GC who's managing everything, then there isn't a ton of time spent checking in on the project etc.
Is it really going to be hard to oversee 5 renos at once? Yes it wont be easy, unless you're doing similar designs for everything and your GC has a large crew where he can manage subs at the same time over multiple homes. Now consider how far away (travel time) is each project from one another?? Factor that in as well
I'd like to think we're capable, but would hate to dive in and find out I'm wrong lol - You need to make highly calculated moves and be financially stable enough with 6 months of carrying costs for you personally as well as the home you're financing to flip/rent/etc. If the market sours or you can't get it rented, or things take longer to get done.. time is money as they say and you need to ensure you have plenty of cash when times are tough/tight.