While customer logged, default session timeout 3600 seconds (60 Minute / 1 Hour).
There are following below steps to increase customer session timout
Solution:
1-Step: By Using Magento 2 Admin
Go to Stores > Settings > Configuration > General > Web > Default Cookie Settings > Cookie Lifetime
By default default session timeout 3600 seconds (60 Minute / 1 Hour), you can change Cookie Lifetime value to any values in seconds
For 1 Hour (3600 Seconds)
For 24 Hour (86400 Seconds)
For 1 Month (2592000 Second)
For 1 Year (31536000 Seconds)
2-Step: By Using SQL Query
INSERT INTO core_config_data (scope, scope_id, path, value) VALUES
('default', 0, 'web/cookie/cookie_httponly', '1'),
('default', 0, 'web/cookie/cookie_domain', NULL),
('default', 0, 'web/cookie/cookie_path', NULL),
('default', 0, 'web/cookie/cookie_lifetime', '31536000');Magento 2 All Database Tables [500 & more Tables]
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Magento 2 Increase Customer Session Time