Interesting!

I tried and got the following:

Trying to send...
array(3) {
  ["result"]=>
  string(64) ""
  ["error"]=>
  NULL
  ["id"]=>
  string(1) "1"
}
Response = 0

replaces what appears to be a hex string that is the same length as a tx hash.

What does this mean?

Also, when you say it could take a while, do you mean the confirmation time?