It is estimated that people spend 10-20% of their lives inside.
true or false i put false

I would say that this is definitely false:

People spent around 8 hours sleeping every day, that is one third of their day.
This means that they would also spend one third of their life sleeping.

Since sleeping is usually done indoors, this means that at least 30% or 40% of people's time is spent indoors - but potentially more.