Jet lag that does not ruin the first days

Shift the light schedule, not the sleep schedule: get bright light in the morning at the destination and avoid it in the evening. Melatonin helps at small doses taken early relative to the new night; large doses mostly make you drowsy at the wrong time.

At ten times the size the bottleneck moves from the operation itself to what it competes with: memory, locks and the people who have to run it. The approach stays, the batching gets smaller and the schedule matters more.