Once the gases start to coalesce and produce heat and light from friction, rather fusion (This is called a Proto-Star). That generally lasts about 150,000 years then nuclear fusion starts and a true star is formed.
Well its a 2 fold answer really. Firstly the gases that form a star take millions if not billions of years to come together. However when a Protostar is formed, this is not a true star as it produces heat via friction not fusion; once this starts to occur it only take about 100,000 years to go from Protostar to Star.
2.6 billions years
10 years.
Many Years. Many Years.
It takes about 10 million years for a star like our sun to form and reach its stable state.
1 million years
As long as they want
1 million+ Years to be a diamonds... :/
Polaris (North Star) is about 433 light years from us, so that is how long light will take to reach us.
1.
One Billion!
it takes a delta to form 100 years or more