02-22-2016, 12:38 PM
(02-22-2016, 09:01 AM)LionKing Wrote: More than 21 hours of exposure per day will not have significant increase in results and may even slow them down, as your mind and brain must have time to process the input for maximum results."
-AM6 manual (SM3 has similar)
In my opinion, more than 16-18 hours per day does this - especially with long-term usage. Once again, just my opinion.