Look at the response by Mark - I hesitate to write that he could miss a 'F':...->getStyle('F2:F'. ($Line-1)) ...
For the limit... A normal use can produce 56k rows ? Ok, fix the limit to 60k. This limit is for safety not for bothering a normal user.
With this number of rows, you must try on real case (and add a margin).
For the limit... A normal use can produce 56k rows ? Ok, fix the limit to 60k. This limit is for safety not for bothering a normal user.
With this number of rows, you must try on real case (and add a margin).