No one has mentioned that with 3% inflation for 35yrs, your $845,000 only has the buying power of $290,000. Sorry about that.
That's accounted for if the 6% was a real return, not nominal. It would then be 845k in today's dollars. I would assume that's the case, one should always use real returns (to avoid having to come up with an inflated number, then do a second calculation to discount it, the way you did).
OP: We can't tell you what it will look like, because we don't have a crystal ball. The best thing to do would be to get a reasonable range. There's two ways to do this:
1) Look up what a "monte carlo" simulation is, and run it. A few times. That'll give you a low and high range.
2) Look up cFIREsim, and see what it would have been worth historically after 35 years over the various timeframes. That'll give you ~100ish results, and a low and high range.
Combine 1 and 2 to get some reasonable approximations of what it might be worth. It'll be a broad range, depending on how the markets go, and in what order, over the next 3.5 decades.