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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
BootySnorkeler
@allObjects
...your're obviously not doing anything wrong: [PICO CLOCK ACCURACY}(https://www.espruino.com/Pico+Clock) search provided me this link...
Not very encouraging... but that it is that bad, I'm surprised, because I'm working on something that would need some better time keeping... glad you pointed out your 'real time' experience.
Which makes me think about a different solution. Most simple is to add a watch crystal, which was initially @Gordon's intent for the PICO, but for various reasons it just didn't pan out. You find other entries in the forum, such as from @DrAzzy, who did work with adding a watch crystal. For 'simplicity' - when no connectivity to a time base is available - adding an RTC module is the only answer... and there are some out there w/ few wires only protocol and very easy to add...