I think you meant " and that's with GPS, and Bluetooth on all the time "
I have had several Garmin watches over the years and the GPS drains the battery in a matter of hours.
I'm currently using the 235 and it lasts a good week with Bluetooth. GPS uses about 10% battery per hour.
You will get more GPS life using one of the Triathlon watches but even then you'll be lucky to get 14-16 hours.