Can't really see the problem with it........ What else are you doing?!?! I constantly do 25min sectors. As well as going through the checklist, I get the weather, and on our PLOGS write down headings, freq changes, cleared levels etc. It really doesn't take much effort to do that. You'll find it's most probably a CAA requirement to have properly completed plogs, with fuel checks and all sorts on. I wonder if the CAA like the pictures I draw??!
Having said that, because I get to do the same route day in day out, I can actually write all the frequencies on the PLOG before we've even left the crewroom. Saves me about 20seconds total time during flight!