All babbling aside - here is an answer to your original question:
If you are talking Open Circuit with a large pair of doubles on your back (ignoring additional stage bottle capabilities) the bottom time is very small - 10min. This includes descent time and results in the usage of 150 cuft of backgas. If you are diving a 10/50 trimix with air as a travel and first deco gas and then 50% and 100% (for argument's sake) you will get the 10 min at 450, start your stops at 260 (at 16min runtime) and work your way up, increasing stop time until your final stop at 10 feet for 16min. Total dive time is 91 min but - like I said - depth exposure time is only 23min below 200fsw.
Good luck - we need a housing that can go deeper than 100M so I'll keep my eye out
If you are talking Open Circuit with a large pair of doubles on your back (ignoring additional stage bottle capabilities) the bottom time is very small - 10min. This includes descent time and results in the usage of 150 cuft of backgas. If you are diving a 10/50 trimix with air as a travel and first deco gas and then 50% and 100% (for argument's sake) you will get the 10 min at 450, start your stops at 260 (at 16min runtime) and work your way up, increasing stop time until your final stop at 10 feet for 16min. Total dive time is 91 min but - like I said - depth exposure time is only 23min below 200fsw.
Good luck - we need a housing that can go deeper than 100M so I'll keep my eye out
