Unless you're cleaning in a hospital setting (or similar), there's no reason to leave Alpha-HP on a surface for longer than 5 minutes. The 10 minute recommendation only applies to dealing with MRSA and VRE. Roughly a third of all people are carrying MRSA around with them all the anyway (usually in their noses) and it's almost always totally harmless; it's only in hospitals (etc) where the presence of MRSA can present a problem. Similarly many people have enterococci (either the 'regular' type or VRE) in their bowels and it does them absolutely no harm whatsoever; once again it's only in hospital settings where VRE can be a risk to patients.
If you're not working in a hospital setting, so that you don't have to worry unduly about MRSA or VSE, the recommended surface contact time for Alpha-HP is never more than 5 minutes. (For example, it's 5 minutes for hepatitis but only 1 minute for HIV). So there would seem to be little, if anything at all, wrong with the training that you've been given. Indeed, other than when you're cleaning in a restroom, it's highly unlikely that anything you apply Alpha-HP to needs any contact time exceeding 1 minute, so you might actually be leaving it on some surfaces for longer than is necessary.