A year is the time it takes our world to go around the sun, and it consists of 10 months, or 200 days. The months cycle with the seasons, and are named Freshwinter, Icewinter, Deepwinter, Softwinter, Thaw, Budding, Flowering, Greensummer, Highsummer and Leafturn. Each month contains four weeks, each of five days. The days of the week are named unimaginatively Firstday and then numerically. This numbering certainly dates from the Conquest, before that some claim the dragons either had no week, counting by days of the month only, or had weeks of varying lengths in different locations, with different, and much more poetic, names for days. Current religious practice accounts for much of the significance of the week, but it also forms such a useful and natural division of time, with four days given to work and one day devoted to higher things, that it seems likely that our ancestors kept some such division even if the details varied from place to place.
Each day consists of twenty hours of eighty minutes each. Each minute consists of eighty seconds. A second is defined as the time it takes to say "One rainbow in Irieth", this being the traditional phrase used to count the seconds between the lightning flash and the thunderclap. If attempting to count seconds, one should speak naturally, neither hurrying nor drawing out the phrase. There is also the "engineer's second" which is very similar in length, but defined as the time it takes a resting drop of water to fall thirty feet. I have attempted to ascertain whether the size of the water-drop matters, and have been told it does not, such are the wonders of natural science.