I had this.
My beard wasn’t particularly long, maybe 2.5-3 inches below my chin (how do you measure a beard?) and mostly trimmed down the sides, but it needed tidying up.
Went to the barbers for a haircut and they asked if I wanted my beard doing also. I said yes, just neaten it up, but keep the length. That guy practically ran number 3 clippers over it and called it a day…