[Trancefury]

Hey guys, just wondering how long everyone leaves (or is willing to leave) their Lyr 2 or similar tube amps on for. If I was to use it while playing pc games for 8 hours, would it be alright? I don't care about the tube life (they are easily replaced), I'm just worried about the actual board and components. It seems that the outer aluminum is meant to be the "heat sink", but the lack of air flow still worries me.
 
Would I be crazy to put an old HDD waterblock on it, or a fan?