Many many times.

If you are on one PNR, you will be met at the door of the plane, most likely they will put out a call before you leave the plane to make sure you meet your escort.

The transit area is rarely used these days, so you will be escorted through passport control (usually the crew area), then out of customs, into arrivals, back up in the lift to departures.

Here you go through the normal security procedure, which means questioning, then along for more questioning and x-raying of luggage, and more than likely pulled over for additional checking (tests for explosives) and more questioning. You are then free to approach the CY check in desk, and will be taken back to passport control.

Once through it's back down to the C pier and if you have time a few minutes in the Dan Broom Cupboard.

This whole process can take anything from one hour to much longer. Don't check in any luggage. If you have anything unusual in your luggage, or any interesting stamps in your passport, then you may be there MUCH longer. And put on some clean underwear in case of extra searches. You may be standing there for some time in them.