We only accept those things real which are physical which have some weight or mass and those which are not real are called Virtual or those who are just in someones imagination and are not yet possible in real world as imaginary.
We all know what time is and we use clocks to measure the time. Time is changing and according to some scientist it is just a measure of change and according to them if we could stop motion of each object of universe than time will have no meaning. According to some scientist time is absolute and it will pass when every object will be still however we will not be able to measure it.