services.journald.upload.settings.Upload.NetworkTimeoutSec

When network connectivity to the server is lost, this option configures the time to wait for the connectivity to get restored.

If the server is not reachable over the network for the configured time, systemd-journal-upload exits. Takes a value in seconds (or in other time units if suffixed with "ms", "min", "h", etc). For details, see systemd.time(5).