First calibration of your display takes about five minutes, a re-calibration only 2.5 minutes. It is using the profile saved in the preferences file that was created after the first calibration.
In case the first calibration was aborted or not executed correctly, the re-calibration uses a wrong characteristic. To prevent such mistakes, now there is the "Full Calibration" function you find in the "Go-to" menu. It executes the full measuring process and creates a new profile.
Upload your newest version here:
Windows XP, Vista
Mac10.3.9 or higher