It depends on the time signature. If it is a 4:4 time then it lasts one beat, but if it's a different time signature then it varies.
The quarter rest has a duration of one quarter of a whole rest, usually one rest.
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one
It depends on which kind of rest it is. quarter rest: 1 beat half rest: 2 beats whole rest: 4 beats.
a quarter rest
Yes if it is in 4 4 tme
It gets half of a beat. Two eighth notes equal one quarter note.
even no sounds counts as a heart beat
A quarter rest is half of a half rest. So there are two quarter rests in a half rest. 3 half rests is 6 quarter rests.
one
a one beat rest is a crochet and looks like a side ways Z and a C attached to the bottom
semi quaver 0.25 beat(like a 7 with an extra line under the top stroke), quaver 0.5 beat (like a 7), crochet 1 beat (like a reverse z with a loop down the bottom), minim 2 beats(a little half box sitting on the 3rd line), semibreve 4 beats (a half box hanging from the 4th line)