Great post Joronda, it's like this with everything in life, not just subs 
On average can you tell me how many hours per day have you used every sub and in which format (ultra or mask)?
Regarding recommended time - you did minimum of 3 months per sub?
On average can you tell me how many hours per day have you used every sub and in which format (ultra or mask)?Regarding recommended time - you did minimum of 3 months per sub?
