How many hours by train from Beijin to Xintal City? When is the last train every day?

Do you mean Xintai city in Shandong Province?
if so, there is no direct train from Beijing to Xintai. but you can get to Tai'an from Beijing by bullet train (2 - 3 hours), and take a bus to Xintai (2 hours). the last one leaves Beijing south railway station at 19:00.