Do you mean how long to deploy or unlock?
They step on it I think, I set up a few and only one got a kill lol. I watched killcams and they ran right passed them and nothing happened.
I'm not sure if they step on it, or if it's proximity activated like the IMS (love that killstreak).
im pretty sure its proximity activated.. and the reason they are running past them, is bc they are using ... drawing a blank - cant think of the perk name.. but the one that has the delayed timer on claymores, bouncing bettys, ect.
Bouncing betties are amusing to target, wait for their owner to stand by it, and then shoot.
Stalker Pro even works on the IMS...
... I'm digging it but it does a little too much.