Used in conjunction with newAndUpdated plugin.

Display listings updated in previous 'x' days.  The value can be quite flexible.  For instance, these all work:

[rover_idx_plugin plugin_type="newAndUpdated" prev_days="1 month"]

[rover_idx_plugin plugin_type="newAndUpdated" prev_days="4 days"]

[rover_idx_plugin plugin_type="newAndUpdated" prev_days="2 weeks"]

Default is "7 days"