This video says about itself:
The female Cahow returned to the nest burrow around 2AM on January 10th, and nearly an hour later settled in to lay her egg. The male was waiting for her when she arrived and the pair spent that hour preening and making adjustments to the nest prior to the egg’s arrival.
The adults will take turns incubating for the next 53-55 days till the egg hatches in late February/early March.
This 10 January 2020 video says about itself:
Bermuda Petrel Adults Switch Off Newly-laid Egg | Nonsuch Expeditions | Cornell Lab
Everything happens quickly at the start of the Bermuda Cahow‘s nesting season! The female returned around 2AM and about an hour later had laid an egg! This clip is from later in the night, as they switch off incubation duties around 5:20 AM.