Wirelessly posted (BlackBerry9630/5.0.0.591 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/105)

The policies for SDC and "standby" are identical in terms of timing. The only difference is whether you clear when you request it or at the gate. You still have to pay for it. There isn't really such a thing as "standby" in the traditional sense anymore, same calendar day or otherwise.