When moving from one main android software to anew one it can take longer but shouldn't be 2 hours @Boo_Taylor3103
Do you have ample internal storage capacity ?
Sometimes the time to update can be defined as to what connection being used i.e mobile data or Wi-Fi.
Also if Samsung Servers are busy this can delay the update.
How are you getting along with the update since you posted ?
Current Phone >Samsung Z Fold³ 5G.
Previous Phone > Note 20 Ultra 5G SM-N9860.