How to help prevent epidemics from spreading<br>Wash your hands when preparing food or going to the bathroom. Practice good hand hygiene by washing your hands with antibacterial soap and water for at least 20-40 seconds. Make sure you wash your hands before and after you prepare food as well as before and after you go to the bathroom to prevent the spread of germs.
Half a minute is a good duration for hand washing
The statement says that you should wash hands for 20-40 seconds. 30 seconds fits within that frame perfectly making my statement correct. The model might have been confused by the sentence structure.
( z0 last :ARG1 ( z1 temporal-quantity :quant "1/2" :unit ( z2 minute ) ) :ARG1-of ( z3 good ) :ARG2 ( z4 wash :ARG0 ( z5 hand ) ) )
(z0 / last-01
    :ARG1 (z1 / temporal-quantity
              :quant "1/2"
              :unit (z2 / minute))
    :ARG1-of (z3 / good-02)
    :ARG2 (z4 / wash-01
              :ARG0 (z5 / hand)))
Half a minute is a good duration for hand washing
z1 :quant 0
z1 :unit z2
z0 :ARG1-of z3
z0 :ARG1 z1
z4 :ARG0 z5
z0 :ARG2 z4