Workflow triggering other Workflow recursively

Hello all,

We are trying to make a workflow to be launched on a weekly basis.

To do that we have 2 workflows :

1st Worflow :

Record Type : Opportunity

Trigger Event : When modified record saved

Workflow rule condition : Checkbox1 = "Y"     (Checkbox1 is not the real name, it's just for the example)

(By default this checkbox is checked, so whenever we modify an opportunity the workflow1 is triggered)

Actions :

1. Wait : Until when : Today() + (5 - (1.0 * IfNull( Mid(1.0 * JulianDay(Today())/7,8,2),0)/(7*2)))     (This wait, "waits" until the next Saturday) (it's fine this is not our issue here)
2. Field Update : We uncheck the Checkbox1

So far this field update, trigger an other workflow, the 2nd Workflow