lol you cannot reset sim.time variable besause it is a SYSTEM variable
so just make other var in console
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scene.my.Jtime := 0.1 (point is needed for real data type)
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scene.my.Jtime := 0.1 -- this you need to insert to console (F11)
also you need ane more var (let it be scene.m.JLtime := 0.1 (Real data type too)
that's the code for your @timer@
in finish box it "oncollide" :
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scene.my.JLtime = sim.time; scene.my.Jtime = {sim.time - scene.my.JLtime} (Braces required)
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in "Time-Show" box we write : text:={""+scene.my.Jtime} (braces required)