Why is my Sony XPERIA XA1 taking so long to update?

Hi, I was sent a request to update my Sony XPERIA XA1 yesterday (Wed) evening. After selecting Continue, my phone began to update...it is still updating, and it has been over 2 hours. I was charging my phone at the time, and i took the charger out, with which the phone continued to update, but only until the battery ran out (not so sure when that happened, as I fell asleep! It was overnight). After charging it for a bit (up to 50%) i turned on the phone again this morning at 7am, the phone began to update again, and has not stopped. Is this normal?

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