Assuming you are capturing a single exposure panorama in a reasonably well lit environment, time to capture is about 10 seconds. Once the panorama is captured iSTAR then processes the 4 source images and saves to SD or external drive. The time to save depends on where you are saving the file e.g. if it's to the internal SD card then processing time is around 30-60 seconds.
But remember - as soon as the panorama is captured you can pick up iSTAR and move to the next location! So normally after about 10 secs you can be moving on to the next scene!
Note: In dull conditions or when using HDR On or HDR Pro the time to capture and save is longer and could take up to around 5 mins before you can capture a second image.