Time is like a winding river. Its shape taken by the relative differences in movement between objects. Objects that have more velocity (someone that flies in an airplane) compared to objects that stay still (a monk), means time passes quicker for the the person or object with frequent velocity. This doesnt mean time moves backwards for the monk, but instead it means the time stretches to allow for velocity within the the same time line. More importantly, time is not endless, instead it is stateless and we simply move through it rather than time moving. in other words, time is fixed and we percieve it by various means of measurements. The arrow of time is just the arrow of our own perception.