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Hi Kevin,
there is no real formular out there, but you can calculate the
percentage of CNS Toxicity.
According to the NOAA table, you have a limit of 45 min with 1.6 bar O2.
If your single exposure is 20 min, then calculate (20/45) x 100= 44.4 %.

For multi- level dives:
Lets assume you have 10 min with 1.6 bar O2
and 30 min with 1.4 bar O2.

NOAA's limit for 1.4 bar O2 is 150 min for a single exposure.

- (10min/45) x 100 = 22.2%   +
- (30min/150) x 100= 20 % 
                    -----------
                     44.2 % total of CNS exposure for a single dive.

Make sure that you also consider the 24 hour total limits.

Peter

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