*edit:* ~~FWIF, active downloads shouldn't time out by default:
> proxy.config.http.transaction_active_timeout_out is disabled (set to 0) by default. proxy.config.http.transaction_active_timeout_in is set to 900 seconds by default.
https://docs.trafficserver.apache.org/en/latest/admin-guide/performance/index.en.html#transaction-activity-timeouts~~ -> FWIF, active downloads shouldn't time out by default:
> proxy.config.http.transaction_active_timeout_out is disabled (set to 0) by default. 
> proxy.config.http.transaction_active_timeout_in is set to 900 seconds by default.
https://docs.trafficserver.apache.org/en/latest/admin-guide/performance/index.en.html#transaction-activity-timeouts