Can't think of a guide, but common sense springs to mind.
Any situation that warrants a return is one for which continuation of the flight would potentially be more unsafe or problematic then could've been avoided by taking a delay in some cases. There are many factors which may come in play including curfew, health, handling, fuel, CTOT, prior delay incurred, FDP, etc.
There is no guide I imagine as one guide cannot contain information on all variables... Apply some common sense and ask yourself the question: "what would I think of this situation if I were on the other end of the equation"