Hello, this was me three weeks ago.
It is horrible and stressful and like being lifted out of your life into some kind of limbo... I'm 40.
My appointment was 10 days after seeing the GP.
Examined by a consultant first, who told me he wasn't too worried. (Even so I cried a bit at him, but I think they are used to it.) He said I might only need a mammogram and ultrasound, the biopsy might not be necessary.
The mammogram was a bit tricky and uncomfortable, (but there was a lot to manouver IYSWIM.) Ultrasound easier, but then they decided I did need a biopsy.
Biopsy was not much fun but again, not too painful. The second consultant who did this also said he didn't think there was 'anything to be particularly worried about' which helped ( but I expect many of them would be totally non-committal, so don't panic if not given any immediate reassurance.) I babbled absolute nonsense to nurse and consultant to take my mind off the procedures.
I was given an appointment 1 week later (a Monday) to come in for results (gulp).
I can't really remember how long it all took, as I was in a bit of a state - maybe 2 hours? felt quite battered and mangled after all the stuff that had been done!
Panicked quietly for several days but got a phonecall on the Friday to say all was fine, and Monday appointment cancelled. :)
Hope you are OK and I'm sure it will be fine.