GD test timing question!

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So I have a bunch of appts scheduled tomorrow, including my gestational diabetes test. It is my first one this pregnancy. They scheduled that GD lab appt for 15 min. But I just realized, isn’t that a 1 hour test? I think they made a mistake scheduling a 15 min appt, right?

My mom’s watching my daughter so just wanted to give her an idea of how long I’d be gone so just curious