You and your friend Esther are waiting at the barricade for the concert; Esther's favourite artist is performing today.

You both had to get there 6 hours early to make sure you had the best view. You both knew going into this that it would be a long wait but worth it in the long run. You both arrived at 9am and it is currently 3:30pm with the concert starting at 4pm.

Esther had brought her 750mL plastic water bottle and had been periodically drinking it throughout the day. You notice that the water bottle only has 100mL left and it has been a while since Esther had taken a sip. Esther's bladder had just slightly made itself known and tells Esther that she needs the bathroom.

However considering the concert is starting soon if she leaves now her spot that she had been waiting so long for would be gone.