AT&T Managed Internet Service (MIS) activation. How long does it take to have someone come out to activate your internet?

Hopefully someone who has used AT&T MIS can help me answer this. I forgot about scheduling to get our AT&T MIS activated today to get internet in our rack in our Datacenter. So I'm planning on calling them first thing tomorrow morning.. but I'm nervous that I won't be able to get someone to come out same day.. but I never had to do this before. When you go to activate your AT&T MIS, do they usually come out same day to activate the circuit? Or am I screwed?