As BoxCar says, you can manually check the FCC website and see if your call sign has been granted quicker than waiting for the email.
I tested on a Saturday and the Laurel VEC's submitted electronically and I confirmed via the FCC site on Monday morning. I started checking at 9 am and saw new grants, but mine wasn't posted until about 10:30 am. Around 11:00 am I called a sign I was familiar with and the ham responded, my first contact the same morning!
The other sources get the data from the FCC ULS site, even the FCC mail looks there.