So, I've got a string of time... something along the lines of

'4 hours'
'48 hours'
'3 days'
'15 minutes'

I would like to convert those all into seconds. For '4 hours', this works fine

Time.parse('4 hours').to_i - Time.prase('0 hours').to_i
=> 14400 # 4 hours in seconds, yay

However, this doesn't work for 48 hours (outside of range error). It also does not work for 3 days (no information error), etc.

Is there a simple way to convert these strings into seconds?