A duo only has a 4 week window so the first time exposure was safe. 12 weeks is a very outdated guideline but some docs still use it for no valid reason.
You have to wait 4 weeks past the last PEP before you can test with a duo for risk #2.
An anecdotal account of someone else's experience does not have anything to do with another person't situation. Getting HIV is a matter of bad luck and is not predictable except from the test result so the only thing to do is try to relax until the test can be done.
This question is extremely confusing given in your other post, you were the one who experienced a condom slip and were on PEP, and now it's your partner who is also male, and he experienced a condom slip around the same time and also took PEP?
1) Test can be taken 30 days after finishing PEP - whenever the last course of PEP was taken, regardless of when the exposure was.
2) No idea. Talk to a counselor about managing stress.
3) I'm not able to explain the behavior of the entire population of people who have taken PEP. Statistics don't lie, and PEP is highly effective.