Constant MIN_MUTATION_INTERVAL_MS 

pub const MIN_MUTATION_INTERVAL_MS: u64 = _; // 750u64

Shortest interval between two content-creating mutations, in milliseconds.

GitHub documents two secondary limits on content-generating requests: CONTENT_CREATION_PER_MINUTE and CONTENT_CREATION_PER_HOUR. 60000/80 is 750, so a mutation every 750 ms is the fastest rate that cannot exceed the per-minute bound, and that is the bound a copy actually trips: a copy of one plan-sized project is a burst of a few dozen mutations inside a few seconds. The hourly bound works out at one every 7.2 seconds sustained, which no single copy reaches and which, used as the spacing here, would turn an ordinary copy into an hour of waiting — so it is deliberately not what this paces at. An installation that wants the hourly bound honoured for a long sequence of copies says so through pacing.min_mutation_interval_ms.