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how long the 23 mm tritium vial will glow?
They say about 12 years. The light is self-sustaining. Remember though, all you’re getting here is the fob. You have to add the tritium vials yourself which could cost upwards of another $50 depending on how many you want to install.
it what puts me off, they say it is difficult to get vials in US
You can't sell in the US but you can still buy I believe.
Roughly ten years, they’ll gradually dim over time. Means you can keep the fob for many, many years, just replacing vials as they wear out.