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  • What Arduino (and SD lib) are you using? Commented Apr 17, 2020 at 15:04
  • 1
    unsigned long long aka uint64_t can hold up to 9,223,372,036,854,775,807. Commented Apr 17, 2020 at 15:05
  • @Codebreaker007 Blue Pill, SD.h Commented Apr 17, 2020 at 15:08
  • @Majenko I'll try that, hopefully that's the most memory-efficient way to do it Commented Apr 17, 2020 at 15:08
  • 1
    8 bytes is all that uses. Same a double. Commented Apr 17, 2020 at 15:08