Constant RESOLVING_RECOVERY_GRACE 

pub const RESOLVING_RECOVERY_GRACE: TimeDelta;

A row still resolving_enrolment this long belongs to a worker that died mid-call, and goes back to ready_to_submit; a parked row’s claimed check expires after as long. Above the resolve timeout, and restarted before each resent half of a split batch, so a live answer still lands.