diff --git a/HP_printer_555/hp_smart_tank_plus_555_head_clean.ps1 b/HP_printer_555/hp_smart_tank_plus_555_head_clean.ps1
index a01fc52..337be94 100644
--- a/HP_printer_555/hp_smart_tank_plus_555_head_clean.ps1
+++ b/HP_printer_555/hp_smart_tank_plus_555_head_clean.ps1
@@ -9,7 +9,7 @@ $running_time_start = 10
 $running_time_stop  = 20
 
 # set day interval between last print and head cleannig 
-$days_between = 0.25
+$days_between = 7
 $sec_per_day  = 86400
 $days_between = $days_between * $sec_per_day