Just adding a datapoint.
OH is a UK citizen. He had GE before but let it lapse earlier this year due to know plans for US travel, but just renewed (after it had expired).
Nov 3: applied for Home Office code early PM
Nov 3: received Home Office code late PM
Nov 4: applied for renewal on GE website early PM
Nov 6: approved without interview early AM.
FWIW, OH has been approved for just over 5 years (5 years after next birthday).