View the original community article here
Last tested: Feb 12, 2018
If Instant Dashboards are enabled, then async query results are kept for 30 days.
Otherwise, the default time-to-live (TTL) for an async query result set is 5 minutes. This can be changed by setting the
-async-results-cache-time startup flag to the number of seconds that results should stay in cache:
# set result TTL to 1 hour