I feel bad about blowing up on them, but I was frustrated that it took a ridiculously long time
How long was it? Did this happen to anyone else you know?
Yes, I once had to wait for an hour.
Our time really is precious, but you should be more in control of your emotions. Having outbursts like this shows people around you that you are very short fused and hot headed. They wouldn't want to associate with you.
Them talking so long is the problem.
How long something takes is sometimes out of a person's hands. It's important that you stay calm when it takes awhile. Losing your temper will only make it worse.