Duration is determined with a dice roll

This is an add-on to Fixed Duration found on page 50 of GURPS Powers. The example is an Affliction (normally margin of failure in minutes) so the base time is 3 minutes instead. Reduced Duration 1/10 reduces 180 seconds to 18 seconds.
Instead, it lasts 1dx5 seconds, which is a range of 5 to 30, the average 3.5x5=17.5 which is less than 18!
Without RD it is 1d minutes (60 to 360 seconds instead of a fixed 180 seconds or a variable margin*60).
The 1st level of increased Duration is 2d+2 (4 to 14) minutes instead of 3*3=9.
This can cause duration to become less or more than the fixed number, and similar in variation to a resistance-based roll except not influenced by it.
Category:Features