Hello Yuji, it would be terrible is hair grew as fast as grass! You are struggling with the heat at the moment, just think that in 6 months, you are going to be struggling with the cold!!!!1 Your RC mower worked well on the grass, but it was difficult at times. Does the grass cutting make it easier, or harder, for animals to enter your fields? It's good that you are sensible about working in the heat and drink plenty! Thank you Yuji san.