Student or Learner
1. After (30 minutes) half an hour, I will go to the park.
2. After (60 minutes) an hour, I will go to the park.
3. After (90 minutes) ....?...., I will go to the park.
30 minutes = half an hour
60 minutes = an hour
90 minutes = ?
Would you please help me on number 3? Is there any name for "90 minutes"? Do you call it "an hour and half"?
An hour and a half.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.