Anyway...I burned the top lid of my old travel coffee mug in the dish washer....yeah yeah...I know...I boiled milk in coffee maker and broke the coffee maker; I heated up my bra in the microwave and burned the bra......me and my stupid ideas...
I got a new coffee mug and it said it will keep hot for 8 hours and I put it in a test today....it worked~~~!!!
A whole work day of hot coffee, great~~~~!!