Laver won the 4 slams from the beginning of the AO, at January 20th, to the end of the USO, at September 9th, which is a period of 232 days spanning the 4 slam wins.
Djokovic won Wimbledon starting from June 29th, and won RG on June 5th, spanning a period of 342 days.
January 20 to September 9: (232 days)
June 29 to June 5: (342 days)
That's over a 100 day difference when you compare the two achievements, and as we all know it's much tougher to maintain slam winning form across a longer period of time, as you're more prone to losing your form.
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Secondly, 3 of the surfaces during Laver's time were on grass, while Djokovic won his Nole Slam on 4 distinct surfaces
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With these two things in mind, it becomes clear to any sane and rational individual that Nole's Nole Slam is the greatest achievement in tennis, and likely in all of sport.
Thank you for your time.