To change phpMyAdmin’s default session expire time (1800 s), change the ‘LoginCookieValidity’ setting to whatever value of seconds You like. From the phpMyAdmin’s wiki’s Config page.
LoginCookieValidity Define how long (in seconds) a login cookie is valid.$cfg['LoginCookieValidity'] = 1800;Maximum value is 2^31-1 , which is around 2.1 * 10^9. This is about 58 years. If you are on a 64-bit system it is even longer. 2^63-1. Longer than the age of the universe.