Is this too much walking on a treadmill?

I work from home and just got a fit bit. Turns out I’m walking about 1,000 steps a day and they recommend 10,000 😬 Got my treadmill out of storage and thinking would it be bad to use it to reach my 9,000 extra steps? That might mean I’d be walking on the treadmill for 3 hours (not all at once but could easily be done as I love the treadmill).

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