Re: Judge on results, not appearances
I've always worked with the expectation that from time to time extra hours will be required and TOIL or extra money will be provided for work above and beyond the normal hours. I think it would be dumb to risk the possibility of both jobs requiring those extra hours simultaneously causing massive problems for you and your employers.
Having said that I think the idea of basically turning yourself into a zero hour contractor will only result in further collapse in management capabilities and hence your dreams of big money,