[FEAT] - Widen the range for the randomization of reproducible snapshots

@johnalotoski noted that there is no real reason to default to 5 min - 10 min. We aim to enlarge the default range from some low value to maybe $10k$. Maybe we also need to scale it depending on the slot length because the delay is in seconds and the snapshot interval is in slots, and some testnets do not have 1 second slots.

The issue names no files or tests. First locate the code that chooses the reproducible snapshot randomization range and trace how slot length is represented; then resolve the intended lower and upper bounds and scaling rule. Done means the agreed defaults and slot-aware behavior are covered by tests.

Written by the indexing model from the issue text.