I'm trying to learn the trills in Bach's Christmas Oratorio. there's a fast bit on the words "cease to be fearful" and I've put it into abc as
X:1.3
T:p3
M:3/8
L:1/8
K:D
zE/F/ (5FGFEF|GGA|BBE|BBA|AA
w:cease -------to be fear ful for get lam en ta tion

But the 5 seem to take longer that a quaver. The online guides have helped for triplets. What should I have put?