In 2026, the Swiss Travel Pass cannot be "extended" in the sense of adding days to an existing physical or digital pass once it has been issued and activated. Because the pass is sold in specific durations—typically 3, 4, 6, 8, or 15 days—you must decide on the length of your stay before purchase. If you find yourself in Switzerland and realize you need more time, the standard procedure is to purchase a second, separate pass for the additional days you require. Alternatively, you can buy point-to-point tickets or a "Half Fare Card" if you only have a few days remaining. While you cannot simply "top up" the days on your current QR code, the process of buying a new digital pass via the SBB website or app is instantaneous. It is a "pro-tip" to always double-check your itinerary before buying, as moving from an 8-day to a 15-day pass at the start is significantly more cost-effective than buying an 8-day pass followed by a separate 3-day or 4-day pass later in your journey.