The Associative Laws say that it doesn't matter how we group the numbers (i.e. which we calculate first) ... ... when we add : (a + b) + c = a + (b + c). ... or when we multiply : (a Ã b) Ã c = a Ã (b Ã c).
To complete the PCT in two months (or less) you will need to average approximately 43.6 mi / 70.2 km per day (this was my longest day on trail).
If you're interested in rapid tests, your best bet is an STD clinic. You can call in advance to ask what rapid testing is available. Without rapid testing, STD test results may come back anywhere between 48 hours and two weeks. That's why you don't want to just ask how soon your STD test results will come back.