In reply to bpmclimb:
Bloomin' long. I have some 5.10 tennie guides (cr*ppy things that they are) but no tape measure. I'm travelling so no access to rulers or normal measuring equipment. (Maybe I could measure it with a bank card then Google the dimensions of a bank card, but I can't be arsed, sorry 😄).
If you mean tennie guide... (the classic 5.10 approach) They have 9 eyelets, which according to the wildly exciting website I googled https://shoelacesexpress.com/pages/length-guide you'd need 63" laces. Good luck finding those.
Try using 3mm accessory cord. The laces they come with them are rubbish and seem to self undo like nothing else in existence (even tried waxing them, but it didn't help) . Use cord instead.
Post edited at 12:17