DV - you need to have your cells in the right format. If you go to format..cells, select number, then time, and pick the format that shows eg '13:30:35' that should work. In the right hand column do '=sum' then drag the cursor along all the ones you want to add together, that should give you the end time in that column. I'm not sure I'm explaining that very well, but it should work.
Weedy - leg feels better today, haven't risked a run on it yet, but managed an hour on the bike/cross trainer in the gym without any issues. I'll try a go on the tready tomorrow and see how it goes.
Simon - er, enjoy your camping. Is the Cockbridge to Tomintoul road still closed by snow?
What Dannirr said about burr grinders - avoid the kind with the spinning blade, they just chop up the beans rather than grinding them. Mine is a Krups Expert GVX231. Adjustable for amount and fineness - seems to do the trick.