1 hour if swimming, 30 min for any thing else.
You should wait 4 to 5 minutes. You don't want to get sick.
If you can walk at all, then you should be able to walk on a treadmill.
All treadmill would give you approximately the same type of cardio workout. To increase your workout, you may want to choose a treadmill that allows you to walk fast or to walk "uphill".
A treadmill.
Does not really matter, I normally walk first and then Bike
1 Hour or less
You burn about the same amount of weight per mile moved, regardless of whether you run or walk. The difference is in how long it takes you to move that mile. The faster you walk, the more you will burn per hour.
you can, although it is though that you shouldn't participate in exercise for 2 hours after eating a large meal
You walk
If you want to work with your laptop while exercising it would be best to buy a treadmill desk workstation. There is a nice treadmill standing adjustable desk at treadmilldeskinc.com. You can walk while you work on your laptop.
In theory, about 20 to 25 months. Any faster weight loss can weaken the heart.
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You can, but for just a little not too long. You want to maybe start moving around or walk after that little break. Or you can just stand after eating.