--retry-delay

Make curl sleep this amount of time before each retry when a transfer has failed with a transient error (it changes the default backoff time algorithm between retries). This option is only interesting if --retry is also used. Setting this delay to zero makes curl use the default backoff time.

By default, curl uses an exponentially increasing timeout between retries.

Starting in curl 8.16.0, this option accepts a time as decimal number for parts of seconds. The decimal value needs to be provided using a dot (.) as decimal separator - not the local version even if it might be using another separator.