avoid upgrade taking too long where there are a lot of subscribers.
avoid upgrade taking too long where there are a lot of subscribers.

mariez/phplist3,samtuke/phplist3,bramley/phplist3,danwaterloo/phplist3,phpList/phplist3,samtuke/phplist3,danwaterloo/phplist3,samtuke/phplist3,bramley/phplist3,samtuke/phplist3,mariez/phplist3,bramley/phplist3,bramley/phplist3,phpList/phplist3,danwaterloo/phplist3,samtuke/phplist3,phpList/phplist3,mariez/phplist3,phpList/phplist3,danwaterloo/phplist3,mariez/phplist3,phpList/phplist3,bramley/phplist3,mariez/phplist3,danwaterloo/phplist3