How many in series years does Gensomaden Saiyuki last?

Answer 1

Well

OVA started in 1999 the Saiyuki OVA

Then the first season Saiyuki TV series started in 2000

Saiyuki: Requiem movie in 2001 was released

In 2002 a one episode Saiyuki Interactive OVa was released

Then in late 2003 the 2nd season TV series Saiyuki Reload came out

Followed by the third Tv series Saiyuki Gunlock in late 2004

and Finally Saiyuki: Reload: Burial OVA series being released in 2007