Testing layers: (should be done in 1-4 working hours).
Logic: do new features reach the goal;
UX: do 3-5 users to reach the goal (provide the task and follows how they succeed);
Languages (and grammar): test at least 2 languages;
SP: 2 languages (product and data): 1) native 2) one of: RTL, Chinese, Italian.
Plans/Access: test with different plans (if needed). How different plans see the same feature;
UI: does it follow our UI principles;
Devices and screens:
3 devices: desktop, tablet, smartphone (browserstack.com) - test both Android and iOS;
2 browsers: Chrome, Firefox, Safari, Edge.
Monkey test: different key combinations and shortcuts;
Test with a slow internet connection.
(If applicable) test while logged into an account and while logged out.
Maximum (most important):