I’m assuming it’s not much, as it’s likely just triggering another relay inside the device (I can probably check this).

EDIT: There is no electrical schematic, but they do show a 24vdc solenoid in the parts list. I could pop the cover and see if that’s where the foot pedal goes, but there isn’t another likely candidate for the switch to trigger. 

EDIT #2: The electrical schematic is under the hood (bless them) and calls for a mechanical relay.

If I can figure out how to post a picture, I’ll include that.

From your perspective, speed isn’t an issue: 500ms should be plenty fast enough. I don’t think I need to worry about timing, but could actually adjust your software to compensate, if that turned out to be necessary.