"A főnök sincs bent."

Translation: The boss is not inside, either.

[RyagonIV]

I think it was here where the voice lady realised how many more sentences she has to record. ._.

[sherm0]

I listened to it and suddenly realized how many more I have to listen to.

[Arpad737071]

"bent van" is used to express that somebody is "at work", i.e. on his/her workplace.