The formula to calculate the lenght of a paper sheet you want to fold in half lenghtwise n times is :

$$L=\frac{\pi t}{6}(2^n+4)(2^n-1)$$

Where L is the lenght of the sheet, t the thickness and n the number of folds.

Determinate the minimal lenght of a sheet of paper (which thickness t=0.02mm), you want to fold :

1. Once
2. Twice
3. 5 times
4. 7 times
5. 10 times
6. 20 times
7. 50 times
8. 100 times
9. 4,928 times
10. 59,258 times

(Yes, I picked random numbers for 9 and 10.)

Good luck !