You could use the
Set number of retries to number. Specify 0 or inf for infinite
retrying. The default is to retry 20 times, with the exception of
fatal errors like "connection refused" or "not found" (404), which
are not retried.
--tries=0 should do the trick.
That, combined with
--read-timeout=seconds too. The seconds refers to idle time: if, at any point in the download, no data is received for more than the specified number of seconds, reading fails and the download is restarted.
So the final command:
wget -c --tries=0 --read-timeout=20 [URL]