I know the instructions are to test after the sun goes down and in the morning before the sun hits the pool. Is there a recommended amount of time between the tests? I’m up at all hours and I’m sure I’d want to test it if I’m up early but I want to make sure I’ve gone at least the minimum recommend amount of time. I’m thinking at this time of year, sun is down about 9pm so would 4 or 5am be long enough (7 to 8 hours)? If more, I’d need to start at dusk and hold off until sunrise plus a bit for the sun to hit the pool. That might get me about 2 to 3 additional hours.