It seems to depend on how old the shutter is and the size. It seems to be a pretty long time, when I've used it. Let's see, there's a Voigtlander Vitessa-L with a little Synchro-Compur shutter, CLA'd in the past year or so, within arm's reach of the computer--counting "one one thousand..." it's about 15 sec. The one on my 90mm Super Angulon seems a little longer than that, last I checked.