All of these variations are quintessentially legislative judgments. It would be very difficult for the Framers to have eschewed deciding 14 years was a constitutional limitation, and for this Court to say 99 years is, and again, even the petitioners aren't asking the Court to make that judgment.
The petitioners are asking for a lengthy constitutional limitation.
( z1 ask :ARG0 ( z2 person :ARG0-of ( z3 petition ) ) :ARG1 ( z4 limit :ARG0 ( z5 constitution ) :ARG1-of ( z6 long ) ) )