Mine is scheduled for tomorrow. Today is going to be a blast (literally)!
If this is your first go-round, consider my advice (learned the hard way)....when you get up tomorrow and slug down the last of the phosphate for the final blowout, stop drinking water after the 'clearance' takes place.
The time before last, I kept drinking water try and quell the starvation - but the result was that would force me to sh*t again......I damned near needed diapers on the trip to the hospital.