It depends on a few things.
What part of the world do you live in?
Do you have any frost to deal with?
What kind of soil are you pouring over?
What kind of prep work have you have done?
Note*If I were going to go to the trouble of pouring cement, I would pour it once to hold up to the most intensive load I would ever use it for.
Good luck and hope to hear back from you real soon,Jason
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