What is the longest amount of time a scientist will investigate a scientific idea

There is no stated amount of time required

Explanation:

There is no stated amount of time required to which a Scientist can investigate his idea.

The least amount of investigations he is to carry out is one in order to make sure his findings are reproducible. He can go on to carry out as many as eight more investigations just to ensure his findings are correct and universally accepted.

italy's population growth rate is almost at zero, the national statistics agency, istat, said on monday, mainly due to a dwindling birth rate.