Without special clothing (desert clothing) you need to take a drink every 90 seconds. With a full set of desert clothing, one drink every 120 seconds; so a full waterskin will last 6-8 minutes.
A better alternative is an enchanted water tiara (it has quest requirements), which is practically unlimited: each "drink" reduces it by one charge, one charge requires 3 water runes, and you can add as many charges as you want.
1 MONTH FOR CHEAPEST
a few minutes.
they can last anything from 1-3 Minutes before one by one they go out.
I can't find specific information, but it will be much less than combat with most monsters. Normally you should have time enough to get to safety. On the other hand, your health will gradually go down, so better take enough waterskins with you. Those will last much longer than food.
It depends how long you are on Runescape.
it only helps to have waterskins
Waterskins. Waterskins can be bought from Shantay, who is located in Shantay's Pass. They slowly dry out over time. consequently, it is often advised that one purchases a surplus prior to going into the desert.
You can purchase desert robes and waterskins before entering the desert, and that usually keeps you cool and not thirsty making you completely safe to roam.
1 MONTH FOR CHEAPEST
its PERMANENT!....forever...
a few minutes.
6 minutes
they can last anything from 1-3 Minutes before one by one they go out.
I can't find specific information, but it will be much less than combat with most monsters. Normally you should have time enough to get to safety. On the other hand, your health will gradually go down, so better take enough waterskins with you. Those will last much longer than food.
It lasts exactly 4 minutes and 32 seconds. i counted =P
I believe an anti fire pot lasts either 5 or 6 minuets.
It depends how long you are on Runescape.