Approximately how long does it take to get to and dock with the ISS?
As a general rule if you watch the ISS overhead (look at
Heavens-Above
You will see a point of light preceeding the ISS in the same orbit* for a few hours, maybe days before docking and a few hours/days after undocking.
* Not really, it's in a slower and higher orbit before docking and a faster and lower orbit when leaving, but you can't tell that with the naked eye.