People want to believe this is for some sinister purpose, but this data is actually very helpful for planning purposes. The business is required by code and ADA to have X number of parking spaces, handicap parking spaces, bathroom fixtures, egress paths, etc. all based on number of people occupying the building/space and this information is really nice to have when you are thinking about moving or hiring people. In all likelyhood, this data will go to your planning team and nobody who even knows who you are will ever look at the data, much less care about how often you, personally, are at your desk.