Is it Enough? Or Too Much?

My dilemma of thinking I weigh too much is making me rethink my exercise regimen with the thought if I do a little more, maybe it'll help me drop some poundage. The first "do more" routine is the bike. Let's see....when can I squeeze in a couple more hours. Mondays are already bike night, as are Tuesday's and Thursday's at the Y on the spin bike. Wednesday is run night and the weekend is a run too along with Sat or Sunday already being a bike day. Wednesday also is a paddle day as is one of those weekend days. Holy crap! I'm already doing a bunch! 4 hours of paddling a week and this ain't no float down the river and put the paddle in the water every now and then. This is sticking the boat in the river and paddling UP stream on flat water, then attempt to get through the really fast stuff in the narrows. I'm definitely sweating until I'm done. The runs are averaging out to be about 2-3 hours a week and the bike is averaging to about 6 hours a week. That's 12-13 hours! Doesn't that seem like enough? Oh, and I lift weights and do some core work for another 1-2 hours a week. So my weeks are about 15 hours total all inclusive. Whoops... there's a little more. I'm an organic gardener. That means turning compost piles and hauling the finished compost to the beds. Right now I don't have one compost pile going -- I have 5. It takes an average of 1/2 hour to turn each pile, water it, and give it a big kiss so it heats up well. Can I include that? You bet I can -- another 3-4 hours a week. So now I'm at nearly 20 hours of physical activity per week. The experts claim an hour a day of moderate to heavy activity to maintain weight -- 7 hours. To lose, 60-90 minutes a day -- 12 hours. Interesting. That would mean at 20 hours, I should have wasted away a long time ago. Bottom line - after figuring out my week of activity, it appears maybe, just maybe, I'm doing enough. And I wanted to add more....huh??