The maximum number of worksheets is 255. If you are planning on doing this
at one time a quick way to add a lot of worksheets is click
Tools>Options>General and select how many sheets you want in the new
notebook. Open a new book and then chage it back to a more reasonable
number. I hope that helps.
No, the maximum number of worksheets is limited by available memory. The
maximum number of worksheets you can instruct XL to open a new workbook with
is 255.