It could be no food since before bedtime the night before. Also, there's often the need to go to the lab (usually in the same building) for a blood draw, urinalysis, etc, and the lab has its own wait.For perspective. I live in Los Angeles and here it is quite possible for that 2 hour window to be a significant factor.
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EDIT - @Ronky mentions food a few posts after this one. Absolutely. The timeline above has no time for a meal, which could mean not eating since maybe 3pm before the 4pm appointment and waiting until after rehearsal or grabbing food and eating at some point (possibly a sandwich while driving).
Honestly I think at this point the OP's just searching around for stuff to gripe about.