IF you want to be PEDANTIC, which YOU probably do, Defenestrator, then YES, it will take about 2 seconds to ACTUALLY drop a magnastick. All the associated work that goes with it is where the extra time is.
For once you're right Wiggum, it WILL take a fraction more than 2 seconds. Closer to 5 secs. Then comes in the MASSIVE loss of time calculating mag read by the factor of 6.7 (maybe 6.5/.6 or 6.8/.9)(depending on global location) to convert the reading off the sticks to pounds and then if you have a remote clue you may be able to ascertain how much gas is on board.
Give it away Wiggum for your own sake. You've insulted every pilot that fly's the metro with your ignorance. Maybe when you graduate to a turbine RPT operation you'll understand the difference. Hopefully so.