1/4 beat
That would depend on the time signature of the piece. For example, if the piece is written in 4/4 time, a sixteenth note is a quarter beat. If the piece is written in 2/2 time, the sixteenth note is worth an eighth of a beat.
A quaver with two tails is a musical note known as a "demisemiquaver" or "sixteenth note." It is worth one-sixteenth of a whole note in terms of duration. In terms of beats, it typically receives half a beat in common time (4/4).
2 sixteenth note
A whole note is worth 4 beats, a half note is worth 2 beats, a quarter note is worth 1 beat, an eighth note is worth 1/2 a beat, a sixteenth note is worth 1/4 of a beat, a dotted half note is worth 3 beats, and a dotted quarter note is worth 1 and a 1/2 beats.
A sixteenth note gets half the value of an eight note. Ex. If an eighth note got one count, a sixteenth note would get one half count.
Sixteenth note
The sixteenth note of a breve is a quaver.
A sixteenth note lasts for one-fourth the duration of a quarter note. In a 4/4 time signature, where there are four beats per measure, a sixteenth note occupies one-sixteenth of a measure. This means that four sixteenth notes can be played in the time it takes to play one quarter note.
Twelve. Remember that the dot always adds one half of the original note to the total - so a dotted half note is three beats in length. (Cut a half note in half and you get a quarter, so a dotted half note is two beats for the half note and one beat for the quarter you added to it) So now you can take those three beats (Three quarter notes) and cut them in half, which is six eighth notes, and then cut that in half and get twelve sixteenth notes. Phew. I hope that made sense.
0.0625 note.
Sixteenth note
If after means shorter length, then that would be a sixteenth note. Two sixteenth notes equal an eighth note.