An eon.
An age is a long period of time that can vary depending on context. In archaeology and geology, an age can refer to a specific time interval of thousands to millions of years. In everyday language, an age can refer to a more general, indeterminate period of time.
Air Mass
The study of the layers of the Earth that have been deposited over a long period of time is called stratigraphy. This field helps scientists understand the chronological order of rock layers and their composition, providing insight into the Earth's past environments and geologic history. Stratigraphy is crucial for interpreting the history of life on Earth and understanding past climate changes.
In historical terms a time before written records is called prehistoric. Prehistory can a vast period of time from the beginning of the universe until writing systems were created. Prehistory generally focuses on the relatively recent appearance of humans and human-like creatures.
The Stone Age is a time period that has actually been divided into three stages. The early stage is called the Paleolithic era, the mid stage is called the Mesolithic era, and the late stage is called the Neolithic era.
A long period of time without precipitation is called a drought.
If a monthly period lingers for a long time it can be caused by a condition called menorrhagia.
It is called a "siege"
Such is known as its climate.
A person who leaves abroad for a long period of time is typically referred to as an expatriate or expat.
The average weather in a particular place is Climate.
Prehistory
Climate is the answer
Endurance
nomads
Over a short period of time it is called a recession and over a long period of time it is called a depression. Don't bother asking what we are in now because the truth is no one KNOWS!!! 2. bear market (novanet) -D.Couch
Some diseases last for a short period of time and/or come on very quickly. These are called Acute Diseases. eg Chest Infection Others last for a longer period of time and/or come on gradually over a long period of time. These are called Chronic Diseases eg - Arthritis