55 lbs in 2 months would be a 27.5 lbs a month. So, depending on the months it could be at most about 9 weeks would would translate into about 3 lbs a week. That would be healthy if u are eating healthy, doing aerobics, and lifting to increase your metabolism. Most forget that when u lift u will lose more than 1 to 2 lbs a week since ur body is gonna kick up the metabolism all day not just during the aerobic sessions. Build your current muscle strength and only a few lbs of muscle, nothing crazy, and u can accomplish this. If u did it in the shorter months then it could be possible still if u were very very overweight and still have some weight to lose at this point. If ur talking about a loss like this to get to ur average weight/height weight then it seems more unlikely esp. since the last few pounds are always the hardest. It said often for a reason!

If ur asking if u should use this as a target since it is possible, I gotta say no. Again, NO. Having this kind of target can be way too demanding and ur expectations are way to great if this is your goal. In truth I would say this amount is more likely to be lost in about 6 months in all truth. U could lose some faster but it would require u not to starve urself. EAting healthy every 3 hours and taking a multivitamin, working out and using circuit workouts once u are in strong enough conditioning. Sorry, but I gotta tell the reality and possibility and you should aim for 2 lbs every week. Look at the weight loss at most a month ahead, and think of it in increments of every two weeks. That is a better perspective. Good luck with ur regimen!!!