Let's check the dive computer display during the actual dive.
There are special displays not found on the dive table.

■No-decompression limit

No-decompression limit is always displayed.
When you are staying at a shallow depth during ascent, no-decompression limit at that depth is displayed.
Even if the no-decompression limit is displayed as 10 minutes at a water depth of 20 m, during ascent, the no-decompression limit will be displayed longer than 10 minutes as the water depth becomes shallower.