On the other hand, there is some very interesting stuff in physics about time. Take, for example, the Arrow of Time. Here's a summary:
In short: Time is weird. We don't really understand a ton about it other than that it exists and moves in a continuous direction. We appear to be able to slow or speed up the passage of time (Depending on the observer). And that's the extent of my knowledge on the subject. XDPhysical processes at the microscopic level are believed to be either entirely or mostly time-symmetric: if the direction of time were to reverse, the theoretical statements that describe them would remain true. Yet at the macroscopic level it often appears that this is not the case: there is an obvious direction (or flow) of time.
I like to think that the longer a couch stays in one place, the more matter it accumulates and thus the heavier it becomes. On the other hand, it's equally possible that memory sucks and it was that heavy before, but it's been long enough that you've forgotten.
Matters plenty. And you can perceive time without a clock. The question isn't whether or not time can be smelled, it's whether or not the sniffers we use are equal to the task of informing a universal force that we can make it move faster or slower. 
