[Rails] What is the best column time to store amount of hours

For example, if I want to store the amount of hours a service takes to
complete such as...

1 hour of consulting
2 hours of consulting
3 hours of consulting

1 hour swedish massage
1.5 hours swedish massage

If it was all whole hours I could just use integer, but note I also need
it for half hours.

TABLE: services
name:string
duration: ???

I tried using time, but since my development database is sqlite3, the
datatype it uses it's datetime and stores the current date.
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