As a freshman at LSU, Days averaged 5.3 points and four rebounds in 14.6 minutes per game. In his next year, he moved into the starting lineup. On January 8, 2020, Days recorded 16 points and 16 rebounds in a 79–77 win over
Arkansas. As a sophomore, he averaged 11.1 points and 6.8 rebounds per game. Days declared for the
2020 NBA draft before withdrawing his name and returning to college. On November 26, 2020, he made his junior season debut, scoring 24 points in a 94–81 victory over
SIU Edwardsville. Days missed one game with a sprained ankle. As a junior, he averaged 11.6 points and a team-leading 7.8 rebounds per game. Following the season, Days declared for the
2021 NBA draft. However, he opted to withdraw from the draft and return to LSU. Days was named to the Second Team All-
SEC as a senior. He averaged 13.7 points and 7.8 rebounds per game. ==Professional career==