Kenneth,
I'm not entirely clear on what you're driving at with regard to your question.
Hours don't overlap with respect to being involved in multiple projects "simultaneously." An hour I spend on project A (e.g., communicating with a stakeholder) doesn't also count towards project B.
For example, if you are managing two projects in the month of July and spent 40 hours on Project A and 60 hours on Project B, you have 100 hours of PM experience for July. As far as MONTHS of experience, this contributes only 1 month, regardless of you being involved in multiple projects.
With regard to roles other than PM that you fulfilled on project teams, they are not relevant in terms of the PMP certification.
I hope this helps.
Regards,
Tracy