Of course. However, Ukraine has a large number of troops with armor training. As I noted above, 90 days should be more than adequate to create highly proficient tank crews. The only job that is fundamentally different is the loader. The T72 has an auto loader. Yes the sighting and surveillance systems are different (and far more effective), but the fundamentals are the same. Also, crew level maintenance will be different but not dramatically so. We spend 22 weeks taking a civilian and making him a tanker (basic and AIT). 90 days would be more than adequate for trained soldiers.
The challenge will be using them as a combined arms team. To do so effectively, the infantry has to accompany the attack in armored fighting vehicles. Artillery will have to maintain pace with the advance to provide supporting fires (difficult for some of the wheeled artillery provided by European allies), and commanders, from company through brigade must orchestrate all that effectively. Normally, air support would be a critical component, but neither Russia nor Ukraine can exercise even local air superiority.
The Ukrainian Army leadership has been actively participating with NATO in exercises and even in Afghanistan since 2014. Obviously, they will no perform as well as a US combined arms team - no one else in the world can. But they do not have to do so. They only have to perform better than the Russians.
