@freemo The rule of thumb in Pharmacology is 2 to 3 half lives with daily dosing before the Limit is approximately reached.
I learned that after around 10 pages of calculations and a professor told me that it didn't need to be that precise. Nice graph, SAGE was the best experience I've ever had with Mathematics Software. Graphs set to output into a LaTeX document or Beamer Presentation, oh god it was amazing.
I wish you well on your journey. Scuba will be a little different now but I'm sure you can handle it.