You can be too granular. I take regular readings as often as I can just for my own graphs, but I track my usage 'trends' on a per week or per month basis based on previous years. I'm also thinking of adding an extra column to my spreadsheet to track outdoor temperatures too, so I can see if spikes tally with particular weather conditions.
This summer has been rather wet so I've used a little less electricity in summer than I usually do as I haven't spent so much time out in the shed or garden playing with power tools!
Don't shoot me, I'm only the piano player. I DON'T work for or on behalf of EON.Next, but am willing to try and help if I can. Not on mains gas, mobile network or mains drainage. House heated almost entirely by baby dragons.