TeamCity test exceeded execution timeout period

Hello,

So i have an issue with a teamCity test execution. I have a test that may take up to 3 hours, but after 30 min it gives me timeout and it stops. The test is failing, yet it is correctly developed. I have tried so many things, yet no success. I am using Visual Studio 2015, and I am using TestStack.White to develop tests, and i run them on another agent using teamcity with MSBuild. 

Until now i have tried to :

- modify failing conditions:" if it runs longer than specified limit in minutes (0 — unlimited)" .. i have tried with 0 and a big positive number

-unchecked "enable hanging builds detection"

- from the project in visual studio, i tried in solution items with and without a .testsettings file, i also modified the test timeouts value (it was by default 30 min) but no success

-i tried to add a timeout attribute in the test file but it gave me:Illegal use of attributes on "blabla" The TimeoutAttribute can be defined only inside a class marked with the TestClass attribute. The thing is i added [TestClass] and [TestMethod], but it is not ok for my case, because with  TestStack.White i have several steps that i want to do in order to have a complete test, and if a add timeout attribute every step in a test will be considered as a test and won't work.

I struggle with this since 2 weeks and i have no other option, i don't know what to do and what to modify in order to modify that timeout value. I believe it is something from teamcity. I am using TeamCity Enterprise 10.0.5.