Fhow long will the fever last

Patient: My daughter had a sudden fever on Saturday night of 103,on Sunday I took her to the urgent care and they had diagnosed with a ear infection and perscribed her suprax* well she continued to have high fevers so today I took her to her pediatrician and he noticed how red her throat was with white looking blisters on it and perscribed her amoxicillian *!!! How long will it take for her fever to go away?!? She took the meds twice today which is her first day

Symptoms: Fever