as a uk citizen married to chinese women how long a visa can i get 1 year 2 year 5 year or 10 year

You can get a Q1 type, which is valid for 30 days after you enter. During the 30 days, you should apply for a temporary residence permit and this permit allows you to stay in China for one to three years. Generally speaking, the officer only gives a residence permit with one-year validity.