Data point: On Friday afternoon I requested a transfer from one SPG account to another at the same address. The transfer posted on Monday morning.
Another data point: On Friday I requested transfer of 20K Starpoints plus 5K bonus for 16.5 WN credits. Still nothing in my RR account as of 3 pm CST Monday, 3+ days later.
My first SPG>WN transfer, so I hope there are no snags.