There is probably no sensible answer to the question which is a reasonable enough question.
What exactly is to be measured: its length or width? Clearly not the area since the answer is required in metres - not square metres.
Is it the average in one city or one country or across the whole world.
What do you do about a backyard for a block of flats? Divide by the number of flats? Or only those that have physical access to the area?
If you can decide on answers to these and then compile the necessary information, I suggest that the answer should be the median measure, not the mean.
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n = number of insects in 1 square meter x area of backyard in square meters (apexx)
7.14 seconds.
approx. 50 seconds
15x20=300 3x3=9 300-9=291 square meters
Almost two meters, on average.