Chosen Solution
I currently bought a used iPhone with a cracked screen but I realized that when I turn on the device it takes longer than an iPhone 5 to turn on, why could this be?
If for “long” you mean minutes it could easily be the audio chip failure that happens when phone has been bent or badly hit. It would require a microsoldering repair to get fixed.
It may have be due to overheating if it was laying in the sun for 30mins. or its time for a hard reset/ after backing up daily used apps to the cloud.
