§395.3 Maximum driving time for property-carrying vehicles. Subject to the exceptions and exemptions in §395.1:
(a) No motor carrier shall permit or require any driver used by it to drive a property-carrying commercial motor vehicle, nor shall any such driver drive a property-carrying commercial motor vehicle:
(a)(1) More than 11 cumulative hours following 10 consecutive hours off-duty; or
(a)(2) For any period after the end of the 14th hour after coming on duty following 10 consecutive hours off duty, except when a property-carrying driver complies with the provisions of §395.1(o) or §395.1(e)(2).
Part 395.3: Maximum driving time for property-carrying vehicles. - Federal Motor Carrier Safety Administration
by the way you worded it, it sounds like you are at the terminal so not (( driving ))
The 14 hour rules only applies to (( driving )) you can't ((drive )) after being onduty 14 hours
there is an exception like say you are out on a regular run and under nomal conditions always make it back in less than 14 hours and JB Hunt crashes or some freak thing like that, you would be able to extend your day to 16 hours. If you where stopped and questioned the cop would be able to check on your story with ease and say ok driver, yes there was a wreck so go on your way.
It doesn't work to say you got caught in a snow storm because at time of dispatch the weather would be known and it would be assumed from the start you would encounter a delay during the trip or peddle run so bad weather isn't always an automatic excuse.
as far as being in the terminal, there is no limit, 20 hours straight or more as long as you don't (( drive )) until you are back within the limits.