No, not specifically a choice you can select. After 2 full days of continuous wearing, literally, the battery has only decreased from 100% to 80%... meaning 10% per day. That equals 10 days with normal used (few dozen notifications per day, 1 alarm per day, continuous HR, sleep tracking, and 30 mins of workout per day). Therefore, "standby" likely means if you take it off and don't wear it at all... thus "standing by"... it can sit there and still hold a battery charge for a month. Since it seems to last 10 days with normal usage, I can see how 30 days of zero usage would still have a charge. LOL