How long is the train ride from Hong Kong/Kowloon to Guilan

Hi, I do not think there is a place called Guilan in China, so would you mind make it clear?
I guess you may mean the Guilin?
If you mean the Guilin city, from HK, there are direct flight to Guilin, but the trains does not reach there.
If you want to take trains, you need to reach Guangzhou first and from Guangzhou Railway station, there is one train K952/K949 to Guilin.