Code review comment for lp:~afrantzis/mir/fix-1576760-increase-timeout

I suspect these timeouts are overly conservative. If these tests start failing they may take a really long time to run since the timeout value is set to 10 at the moment. We should probably change the timeout to something like 2 or 3, and the (two) instances that require more than that can be hard-coded to have 5 or 10.