Appliance manuals devote pages to safe disconnection and none to the real cost of unplugging an oven: the flashing 00:00 that outlives every other consequence.
Plan backwards. Estimate the repair, subtract it from the next midnight and begin then, so power returns at the moment the clock would have read 00:00 anyway. Field notes: a 40-minute element swap begun at 11:20 p.m. resynchronised to the second. A 90-minute hinge job, delayed by one screw, restored the clock at 00:47, requiring a second repair the following night to correct it.