How To Increase session timeout to one day In Magento

In many of my projects faced problem like session timeout in magento i.e. when i am importing products when those are of greater then count 5000 so i came up with the solution given below hope this could help you also
Session SQL

INSERT INTO core_config_data(path, value)
VALUES ('web/cookie/cookie_lifetime', 86400)
ON DUPLICATE KEY UPDATE value = 86400;

From Admin Panel:

System -> Configuration
General > Web
Session Cookie management
Cookie Lifetime: 86400