GULC II No More Time Slots

I received an GULC interview invite email and 30 mins later, all time slots were full. They say they will email more in the "near future." Does anyone have any idea how often they send these emails so I can keep an eye out? Is it at the same time every week (i.e. I received mine Mon at 9am EST)? As an ED applicant, how will this impact my timeline? Any insight will be helpful!