How much time should I set aside for a Density appointment?

Lately, while looking into Density, I've also been searching for its effects.
Now that I'm actually trying to make a reservation, I'm actually a bit worried about the treatment time.

I work, so I would like to receive it on a weekday evening.
It is difficult to schedule an appointment if the process from consultation to the procedure takes longer than expected.

Is it just the actual procedure time that is short?
I also want to know how long the total stay at the hospital is.

For those of you who went straight after work, how much time did you allow?