# What is bottom time in scuba diving?

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## What is scuba bottom time?

bottom time. Time used in calculating decompression obligation from decompression tables. For most tables this is defined as the elapsed time from starting the descent to starting the final ascent to the surface, excluding ascent and decompression time.

## How do you calculate bottom time for scuba?

To calculate your bottom time, you count the minutes and seconds that you stay underwater, beginning from when you splash into the water and ending when you return to the surface. You can’t stay underwater forever when diving. Scuba tanks can only hold so much gas.

## How long should you wait between dives?

Surface Interval Time (SIT) must be at least 10 minutes between dives. If your SIT is less than 10 minutes, you must consider your second dive as a continuation of the first dive. NAUI recommends a SIT of at least one hour between dives. Use the next greater dive time if your dive is particularly cold or strenuous.

## What is NDL diving?

The no decompression limit (NDL) is the maximum allowable dive time that you can remain at a specific depth and ascend directly to the surface without requiring staged decompression stops on the way up. Remember the higher the partial pressure of nitrogen (ppN2), the shorter the dive time (NDL).

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## Does nitrox increase bottom time?

As stated, when you dive using nitrox you can take advantage of increasing your maximum allowable bottom time. This happens because the extra oxygen added to your breathing gas when it was filled has displaced nitrogen.

## How long can you scuba dive at 30 feet?

BSAC and PADI no-stop dive times:

9 metres (30 feet) dive depth: BSAC no decompression time limit of 243 minutes (PADI Tables 205 minutes).

## How many times can you dive in a day?

For recreational divers, a typical limit is 4-5 dives per day as long as you follow dive tables or use a computer to track. For shallower depths, you will need to refer to dive tables to be able to determine how many dives you can safely do in a day and how long those dives can last.

## How long can you scuba dive at 60 feet?

The NDL or No-Stop time for 60 feet / 18 meters is 56 minutes according to the Recreational Dive Planner table.