This user self answered his question:
How did he accept it so quickly? I thought there was a 48 hour delay between posting and accepting?
This user self answered his question:
How did he accept it so quickly? I thought there was a 48 hour delay between posting and accepting?
The 48 hour delay is between posting the question (2015/5/1 16:30) and accepting the answer (2015/5/3 20:36). That is 2 days, 4 hours, 6 minutes there.
More info here.