It comes down to respect and trust. If I just undo this harness right now and see if I fall...'Doing it one years, doing it two years... It's too complicated. It's too concerning to risk anything. 'But it's happening for a lot of people.
The harness is completed using only one year.
( z0 complete :ARG1 ( z1 harness ) :manner ( z2 use :ARG1 ( z3 temporal-quantity :quant 1 :mod ( z4 only ) :unit ( z5 year ) ) ) )
(z0 / complete-01
    :ARG1 (z1 / harness)
    :manner (z2 / use-01
                :ARG1 (z3 / temporal-quantity
                          :quant 1
                          :mod (z4 / only)
                          :unit (z5 / year))))
The harness is completed using only one year .
z0 :ARG1 z1
z0 :manner z2
z3 :quant 0
z3 :mod z4
z2 :ARG1 z3
z3 :unit z5