That was the process last year (report time based on last digit of SS#). But, if you showed up early they ushered you into Ike Hall and started the process. Heard some parents were taken aback when they showed up early, then were led into the auditorium; they thought they would have more time with their new cadet and instead were given the 60 second good-bye.
I don't suggest those with later report times show up too early (ie 2 hrs before your assigned time). Everyone will eventually be processed and go through the same things. Understandably some new cadets are anxious to get started -- but it is a very long day for both new cadets and parents/family members ... especially if this year's R-Day is as hot and humid as last year's. (Then it rained for a good hour before the scheduled parade review, with anxious parents waiting to hear if they would even get to see their new cadet.)
Last year's schedule was: SS#'s ending in 0, 1, 2 or 3 report to Ike Hall between 0645 and 0800;
4, 5 or 6 report to Ike Hall between 0800 and 0915;
7, 8 or 9 report to Ike Hall between 0915 and 1030.
No guarantee this year's R-Day report times/process will be the same as last year. Recommend you wait for the memo (last year's memo came out 2 April).