I have that lawn mower and a 100' ft outdoor extension cord I
inherited from Dad. He got it to run power tools, so it's pretty
hefty. I have no problems with running the lawn mower on it.

By the way - I really like the mower - it handles damp long grass just
as well as short dry grass. So long as you realize that mowing with a
cord will change the way you mow, you should have no problems.