Can a 30 minute walk be replaced by two 15 minute walks?

I have a full time sit down job and the only time I can exercise is during my breaks. Me and 4 other co-workers use our breaks to walk around our building. We measured how many times around equals one mile and we do a mile twice a day (It actually takes us 20 minutes each time but luckily we have a pretty cool boss and she doesn't quibble about 5 minutes :-) But I've read that the body doesn't start burning stored fat until after 30 minutes of walking. Am I wasting my time? I sure hope not because I don't have time to exercise otherwise and I am desperately trying to jumpstart my weightloss again. I did not lose a lot of weight after surgery (426/317 in 2 years) but I still can not eat a large volume of food and I still dump sometimes so I'm trying to do this without a revision. Anyway we get a pretty good workout. Our office is on the 3rd floor so we always take the stairs for our walks--I'm talking twice a day 5 days a week, something I would never do before wls. Sooooo! My question is can I expect to lose weight walking a twenty minute mile twice a day?

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