Roughly once every new computer. Although I will often take that chance to try 3 or 4 different Linux distros just to see what works best and if any of them ar

Roughly once every new computer. Although I will often take that chance to try 3 or 4 different Linux distros just to see what works best and if any of them are doing anything new and interesting. However once I pick one I will generally keep it until next major hardware upgrade.