This is my smallest lot, well... second smallest. I have one property that has a Mini-Mansion sitting on a postage stamp lot, so there is only 15' x 80' front yard, 20' x 80' in the back. The rest is all house on 80' x 125' lot. I charge him $30 too.
The grass is the same on both properties, same condition, same type. And just for reference. I am a one man show, my labor rate is only $65 an hour, and I do that lot in 20-25-minutes (cut, trim, edge, blow). He was done in 10, and is also a 1-man show.