Napkin math: There are roughly 3,500 calories in 1 lb of fat. To lose 50lbs of fat, that’s 175000 calories.

Let’s get an upper bound of 31 days per month, for 2 months, that’s 62 days. 175000 / 62 approximately 2822.5 calorie deficit per day required. The actual number would be higher.

The other aspect of this is that, generally speaking, the majority of “quick” weight loss is pretty much always in the form of water loss. Water weighs around 8lbs a gallon. So, you’d need to drop about 6 gallons of water to achieve that kind of weight loss.

Neither of these are safe, reasonable, or practical in that time frame, for the average person without medical supervision and/or other professionals supporting you.