My Mom's family had a different solution. At 7 o'clock, call. If you let it ring once then it means pick us up now. If you let it ring three times, then pick us up in an hour.
Thinking about it now, Skype gives rings on the caller's side even before it's connected on the receiver's side. In that case, use synchronization. If it takes between 1 and 4 caller rings for the receiver to ring, then a call at 7:00 means "come now" and a call at 7:05 means "come in an hour."
Thinking about it now, Skype gives rings on the caller's side even before it's connected on the receiver's side. In that case, use synchronization. If it takes between 1 and 4 caller rings for the receiver to ring, then a call at 7:00 means "come now" and a call at 7:05 means "come in an hour."