I have Magnecraft W171DIP-25 reed relays (datasheet). They are DPST relays with a built-in coil suppressor (according to datasheet). Their listed response time is 1 ms, and, following the logic of this question (Do reed relays have shorter opening than closing time?), I would expect the release time to be at least 1 ms.
I measured the release time with an oscilloscope: 0.1ms.
I'm not complaining, but why is this? I did it in two distinct (identical) setups: same result.
I don't have a 5V supply available on the board, so I just ran them off of a 8V supply and stuck a 100 Ohm resistor in from of the relay (the coil resistance is 200 ohm like on the Mouser site, NOT 500 ohm as in the datasheet). I used a NPN transistor to switch the relay.