I wanted to drag my pump session, currently i am pumping 3 hourly, 3 times at work. However, due to work schedule if i wanted to drag pump, it can only be 5 hourly apart. I wanted to know from the sudden change of pumping 3 hourly to 5 hourly, is it okay? Will i risk myself with mastitis and decrease of supply? Thank you.

Think you will feel more engorged at the beginning as your body adjust and adapt to the new schedule. Be sure to empty your breasts when pumping on the new schedule. Supply wise, everyone is different, but I think it is likely that you will notice a slight drop as you will be pumping less frequently as compared to your initial schedule.