Graduation questions

Hey y’all! So I know it’s super early considering my boyfriend just finished his first week of basic, but me and his parents are already looking at flight tickets, hotels, etc. I was wondering what yalls experience with USMC graduation was like? Or any input really! Are they able to fly home the same day of graduation? And if yes, what time would be best for a flight back? Also was wondering what time yalls graduations started and ended. Any help is appreciated! Thank you :)