I’m not sure what lily pads so I went with the largest which have around 7.069m^2^ of surface area or 0.0000007069km^2^ surface area.

Earth has a surface area of 510,064,472km^2^

After 120 days of doubling we have

6.64614x10^35^ * 7.069x10^-6^ = 4.6982Ex10^30^

So you are correct but it’s also around 23x the surface area of the sun.