may i know how long is the transit time (by bus) from Xian Railway Station to Terra Cotta Warriors ?

If you take the tourist bus line 5 (no.306), the trip takes around 70 mins.

May i know how many station(s) bus no. 306 will stop and which station(s)?

It will stop at 9 stations, which are Shilipu, Lintong Campus of Polytechnic University, Lintong Campus of University of Science and Technology, Xinjiang Military Area Sanatorium, Ground Force Sanatorium, Huaqing Hot Spring, Lintong Dongguan, Dongsancha and Terra-Cotta Warriors.