If you're flying without using a 'PLOG' carry a pack of 'post-its' for scribbling down airborne/landing times plus clearances etc. (One 'post-it normally does each flight I find). Then tear 'em off at the end of each sector (very handy for multi sector trips) and stick them on the inside cover of your Pooleys (or whatever else you use) until you do your logbbok.