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It can be seen from the graph above that the Inspiration dramatically increases No-Stop Times compared with open circuit.
Inert gas (ie.nitrogen) absorption or gas loading - limits the dive time allowed at different depths before you are obliged to take decompression stops. On open circuit you are constantly breathing 79% of nitrogen throughout the dive.
Oxygen-rich diving with the Inspiration means that the percentage of inert gas in the mix is considerably lower and varies with depth. For example, (diving on Setpoint 1.3 bar) there is zero % nitrogen in the mix at 3m (ie.100% O2), 35% nitrogen at 20m, 68% nitrogen at 30m and only increases to the open circuit level of 79% nitrogen at 50m.
This means that with the Inspiration there is greatly reduced inert gas loading throughout the dive and consequently allows significantly increased No-Stop Times.