maxExecutionTime
Approximate wall-clock budget the platform gives this invocation.
Android Standard: ~10 minutes.
Android Expedited: ~10 minutes (foreground job).
iOS Expedited (
BGAppRefreshTaskRequest): ~30 seconds.iOS Standard (
BGProcessingTaskRequest): "several minutes".macOS: system-determined; we report a conservative estimate.
Not enforced by the library — it's a hint for worker code to budget against.