2 years. Always follow the 5 years to play 4 rule.
However, at the conclusion of his 5th year, he could petition the NCAA for a 6th year, arguing that his second year was too injury plagued to count.
Unless something has changed, we do not want his eligibility for next year. We want him to take a full year off, heal, train, get his mind right and be ready for 2020.