Other timing conventions?

[todo]

scrapbook/scrapbook/models.py

Lines 104 to 109 in 7b3871a

	# TODO: Other timing conventions?
	cell.metadata.get('papermill', {}).get('duration', 0.0)
	if cell.get("execution_count") else None
	for cell in self.node.cells
	]

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This issue was generated by todo based on a TODO comment in 7b3871a when #3 was merged. cc @MSeal.