SQL Server 2008 R2 - Change Tracking - Autoclean up is not working

Hi i am trying to test the Change Tracking SQL Server feature.

I created a new DB and a single table with just 3 columns.

I enabled the Change Tracking, put the retention period as 1 and the retention period unit as minutes, with the auto cleanup in true.I enabled the change tracking in the table with the track column updated in true.

I inserted several values, updated some others, the CHANGE_TRACKING_CURRENT_VERSION incremented as expected but after the minute i didn´t see any reset, any clean. In fact i am still waiting for  that minute.

My SQL version is:

Microsoft SQL Server 2008 R2 (SP1) - 10.50.2500.0 (X64)   Jun 17 2011 00:54:03   Copyright (c) Microsoft Corporation  Enterprise Edition (64-bit) on Windows NT 6.0 <X64> (Build 6001: Service Pack 1)

Best Regards