If this area is considered by the people of your hometown to be a traveling distance, you may shorten the whole period

I went to seminar for 15 days to University. The location is 55km from my hometown. It’s also rural area. I’ve been in this university or this place before. We’re given dorms but to eat we travel 1.5km away. When I asked a sheikh about this, he said “you are considered as a traveler and you can shorten and join prayers for 15days but the maximum is 18days.” since then I’ve been shortening the prayers. Is this correct?

Prayer |