for lots of years??

[nancrisatr]

I wonder if this the phrase in red is correct or if there's a better way to say it: "If he had killed somebody, he would have been put in prison for lots of years"

[BobK]

I wonder if this the phrase in red is correct or if there's a better way to say it: "If he had killed somebody, he would have been put in prison for many years"

- "lots of years" sounds rather infantile.

b