Lets look at what time really is. Lets take a day, we have days because its 1 rotation of the eart on its axis. Taking the newly found day and splitting it into 24, we have hours. So a 24th a day is an hour. We do the same with minutes and seconds. So basically a second is the distance the earth has traveled, basically its traveled 1/86400 the distance of a usual day. A year is how long it takes the Earth to Rotate the sun.
With the cat, for one they think we are their slaves, so she misses her slave, but back on topic, animals have a sort of semblence of time in one way or another. The cat knows when you have been gone 5 minutes and when you have been gone an entire day, by the positions of the sun. Migratory birds know instinctively when it is time to migrate.
Time is a creation of man to organize ourselves and things. If for some reason Earth and Mars switched places, we'd have to re-organize time as from what I read, it takes about 30 earth hours for 1 day in mars.
Sorry for sounding so serious
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