Hello from the construction zone

So, it's true that no one is required to wear a hard hat at work anymore, but there are new challenges.

Today's question: How long does the fire alarm need to go off during a "test" before it's pretty clear that it's working just fine?

The new fire alarm goes off in blasts of three deafening buzzes, followed by a little pause, then three more deafening blasts. Apparently this can continue for any length of time--five minutes feeling roughly equivalent to an hour. In case you are deaf (which at the moment seems a pleasant fate) there is also a very bright flashing light--the kind that I think would induce an epileptic fit in some.

Morale, needless to say, is very high.