Your friend might be having the three hour test.
That's usually done first thing in the morning after an overnight fast.
The one hour test (more common one) is done at any time of day and no fasting needed.
Usually you would do the one hour test and if you fail that, you'd do the three hour. But some doctors just go straight for the 3 hour test, particularly if someone is considered at higher risk of having GD.
HTH