Is your feature request related to a problem?

Original discussion #7268

It's easy to unintentionally overwrite the default total timeout value when changing another, more specific, client timeout:

timeout = ClientTimeout()
print(timeout.total) # 300, default value

timeout = ClientTimeout(connect=5.0)
print(timeout.total) # None, default value is lost

ClientTimeout.total should be preserved when any other timeout is changed, but the total timeout value is not explicitly specified.

Describe the solution you'd like

As suggested in the original discussion, the default 5-minute timeout value should be set directly in the ClientTimeout class, not later in the ClientSession.

Describe alternatives you've considered

An alternative solution could've been changing the documentation and describing the behavior there, leaving the responsibility to explicitly specify the total timeout value to the user.

Related component

Client

Additional context

The issue is created in preparation for the PR.

Code of Conduct

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