UPDATE 14/1/2016: If you want to track lunch times when you leave the office version 2 of my spreadsheet will enable you to do that. It has both the original timesheet and timesheet 2 which includes new time slots for departure for lunch and arrival back at the office from lunch. http://bit.ly/IFTTTtimesheet2.
Locate your workplace on the map, rename the spreadsheet if you want – I recommend keeping the data fields for the spreadsheet the same if you want to use my spreadsheet (link above) and you’re good to go.
The spreadsheet will log your arrival and departure times, then calculate the time you spent at work and graph it. The spreadsheet includes some example data so you can see how it works.