2 rounds.
1st was phone screening, recruiter was friendly and did not ask detailed questions about resume which was surprising. Focused more on interest in Trainee role and Travelers. Took about 40 minutes.
2nd was in-person interviews. Plural. Three separate interviews back to back:
1st was with panel of Unit Managers and Director. STAR format, probably about 1 hour.
2nd was peer interview with someone who finished the Trainee program. Much more casual, conversational format, about 20-30 minutes.
3rd was with regional vice president. STAR format again, honestly do not remember how long it was because my brain started running on auto-pilot towards the end of VP's questions.
Took 3-4 weeks for original application to be picked by recruiter for that phone screening. Got a call 1 week after phone screening to schedule in-person interview panels. Took 2 weeks after in-person interviews to hear back.