Yes. You can set the parameter TimeBetweenTestSuitesExecution to whatever delay you want to have. To change this parameter, go to the library references and select TcUnit, then go to GVLs → GVL_Param_TcUnit → TimeBetweenTestSuitesExecution. Default this parameter is set to T#0S (zero seconds, i.e. no delay). For example, in the below screenshot this is changed to 5 seconds.
Required TcUnit version: 1.2 or later