Welcome to HCM.
It is not the duration but the wetness of pad that counts. If the pad is soaked, then the longer you wear the higher the possibility that you could get fungal infection
If the pad is perfectly dry there is no harm in wearing it for 8 to 10 hrs. Once the pad gets wet then you should change it at least in 4 hours, for better hygiene.
Wish you all the best.