A bit of mathematics then:
S1 = 21981 [min]
S2 = 9881 [min]
Your Garry's Mod playtime =
i dont play other servers only zarp and only darkrp + ther is game tracker up ther you can check
S1 + S2 = 31862 [min]
31862 does not equal 84600
Just to clarify

sure you know game tracker usualy count for me idk why it mean i should have more ill show you my history of gmod servers