???? One more. I've had the rest period explained to me by a few different charter guys and all gave me different answers! Didn't really talk to much about it in my check out

I fly lab tests samples every night around the same time or when ever the delivery truck arrives. Is this considered scheduled or on demand? I apologize if these are dumb questions to the seasoned vets.
Look at your company provided Operations Specifications - Part A. In it you'll find the reference to 'flight time limitations and rest requirements' - in mine its page A036.
If you don't have a copy of the regs at hand, you can google FAR 135.
Sounds like you are scheduled, therefore 135.265 [ref:Ops Specs] otherwise 135.267
If you are scheduled and operating single-pilot then you are limited to:
1,200 hours in any calendar year.
120 hours in any calendar month.
34 hours in any 7 consecutive days.
8 hours during any 24 consecutive hours for a flight crew
consisting of one pilot
No certificate holder may schedule a flight crewmember, and no flight
crewmember may accept an assignment, for flight time during the 24
consecutive hours preceding the scheduled completion of any flight
segment without a scheduled rest period during that 24 hours of at least
the following:
9 consecutive hours of rest for less than 8 hours of scheduled flight time.
9 consecutive hours rest may be scheduled for or reduced to a minimum of 8 hours if you are given a rest period of at least 10 hours that must begin no later than 24 hours after the commencement of the reduced rest period.
Each certificate holder shall relieve each flight crewmember
engaged in scheduled air transportation from all further duty for at
least 24 consecutive hours during any 7 consecutive days.
If you are going to juggle flight instruction and the charter flying, I would strongly suggest you take it upon yourself to thoroughly understand the rest and duty regs. Your boss isn't necessarily going to look out for you on this one, given the two sides of his/her business.
? Are the lab test samples carried, going to or from the lab??? See where I'm going with this one???