it is up to 6 hours per

it is up to 6 hours per it.is.up.to. It is up to It is 6:50.It is time to （）up. It is up to you it is up to you it is up to me it is up to sb to do It is up to you to decide . It is not___good idea to driver for hours without break. I( )it is important to sieep eight hours a night. It is up to you 是什么意思? It is up to you 什么意思? it is time to give you up It is time to end up. 英语 it is just up It is just up to what you want to say it is just up It took me almost two hours (making) her up.为什么不用to make it is your turn to clean-up还是 clean up