How long do I have to wait to start doing light exercise after Liposuction; A mile walk, or treadmill etc..

While I always encourage my patients to not spend all their time in bed following surgery (leisurely activity minimizes the risk of deep clots in your leg veins and helps with swelling), I would not recommend doing any rigorous physical activity until about 3-4 weeks after surgery. This can even be longer depending on the extent of surgery and how you're recovering.   

Light Exercise such as short walks can begin 2 weeks after liposuctionLight to Medium Exercise such as a one mile walk, 20-30 minutes medium intensity on a treadmil or cross trainer,  light resistance exercise should wait until 3 weeks after surgery.  Occasionally I will let someone begin earlier if they are recovering quickly so it is Okay to ask your doctor if you feel like you are ready.Always listen to your body and stop exercise if you have unusual pain, swelling or fatigue that surprises you or you have not felt beforeWear a light compression garment during exercise until 6 weeks after surgeryFinally, don't expect to start where you left off.  Give your body time to adjust over 2 - 3 weeks and gradually work your way up to your previous level of intensity

I would suggest waiting at least 1-2 weeks, depending on how you are feeling, to re-start your exercise routine.