The number of times to retry a request to the same SNTP server
that has 'timed out.'. This retry count is
used for directed SNTP requests in unicast(1) administrative mode.
For example, assume this object has been SET to a value of 2.
When the SNTP client queries a given server it will send 1 SNTP
request frame. If that original attempt fails, the client will
retry up to a maximum of 2 more times before declaring the unicast
poll unsuccessful and attempting the next server.