I was wondering if the reserved blocks would count towards the 40 hour limit for the work week?
You are not an employee so the 40 hour work week does not apply.
I believe you were only partly correct. You are correct that we are not employees of Amazon. However, Amazon has set a limit of up to 40 hours per week that each independent contractor may work. If you check your availability settings and set all of them for Max availability, you will notice that Amazon has a section stating that you are willing to work up to 40 hours per week. Just as they are able to set the pay rate, they are able to also set the maximum hours that an independent contractor may work with their company per week.
My availability is 70 hours per week - 8am to 6pm 7 days a week.
Now look towards the top of the screen in your app. There’s a box that will say that you were available to work up to 40 hours per week not 70 hours per week.
Specifically, it says “I want to deliver up to 40 hours per week”
Wow people on are asking these questions and I can only get a 2 hr block per week from tapping , no more reserves for me 
and tapping like a crack head
Nice consistency by Amazon. WTF?
What market are you in?
I am in Minnesota. 
I’m in California. Different states - maybe different state laws.