The Merge Documents window has a default timeout value of 10 minutes, allowing the user sufficient time to complete the document merge.
In the PDF Printer Driver, the timeout value cannot be configured through the Printing Preferences or the Printer Manager.
One can adjust the timeout value by editing the Printer Driver INI file.
The Printer Driver INI file is typically located in the following directories:
On both 32-bit and 64-bit Desktop operating systems
C:\Windows\System32\spool\drivers\w32x86\3\BuPIniNT.ini
C:\Windows\System32\spool\drivers\x64\3\BuPIniNT.ini
To modify the timeout value, open the INI file with any text editor as an Administrator (for example, Notepad), and edit the “Merge Window Timeout” key. The timeout value is specified in minutes, with a maximum value of 1440 (24 hours).
For example:
To increase the timeout value to 30 minutes, modify the "Merge Window Timeout" value to "30" in the INI file:
Merge Window Timeout=30
Save the INI file.
Though for most INI file keys, it is necessary to Restore Defaults to apply the new value, the “Merge Window Timeout” key is an exception.
Please do not “Restore Defaults” to apply the new timeout value.