I was a jetbridge trainer 20 years ago... can't imagine much has changed since then, but assuming the bridge is pre-positioned in the right spot, and the floor is at the right height, it shouldn't take more than a minute from the time the wheels are chocked to the time the auto-leveler and canopy is down.
There are exceptions to everything (i.e. waiting for a piece of ramp equipment to be moved out of the way).
The procedures should be identical from station to station -- there are subtle differences in control panels, but there are only three or four companies who build the things, so the variations aren't that big a deal. An apron drive is an apron drive, regardless if it's a FMC/Jetway, Hobart, Mitsubishi, or some other manufacturer. The fixed bridges are even easier -- you only need to figure out up/down/backward/forward.
Where I see differences from station to station is when the agent is at the controls. Some stations still believe it is from the time the aircraft is on the ground, while others it is almost always after they're on the lead-in line. Other major difference is whether or not they stick around after the bridge is pulled but the aircraft is still on the gate. Personal feeling is they need to be there until the pushout tractor passes the bridge... If there's a need to evac the aircraft while it's still on the gate, blowing slides into the ground equipment seems to be a really bad idea...