Student or Learner
"barely" is hard to interprete, in this case it means "almost less than 20 minutes", a little bit positive meaning, but as in "There was barely any smell", it means "almost no", a negative meaning. How do you tell the difference?
st94)Today I participated in community service work in a garden area. What was great to see there was that most of the students barely took 20 minutes to finish their lunch....
"Barely" in both contexts translates as "hardly".
It took hardly/barely 20 minutes.
There was hardly/barely any smell.
Hope this helps
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.