viper-change-notification-threshold

viper-change-notification-threshold is a variable defined in `viper-init.el'.
Its value is

1

Documentation:
Notify the user when this many lines or characters have been deleted/yanked.
For line-deleting/yanking commands (like `dd', `yy'), the value denotes the
number of lines. For character-based commands (such as `x', `dw', etc.), the
value refers to the number of characters affected.

You can customize this variable.