Not certain if this would help anyone, but I made aSol-Lune BT rewards calculator on google docs.
(there is no link because my account is too new
If you type in the Current BT points that you have in the yellow box it will tell you how many times you have to run quest 25-3 to get the next reward. Then how long that will take in minutes then hours. I put 6 minutes per run in assuming I won't be super on top of it (because I am making weird google doc spreadsheets and such), but that can be changed.
This was a really quick thing I threw together, and I don't know if it will help anyone. Mostly it tells me what is in reach and what isn't.