There is no "right" time for anyone to wait - it depends on your heart. When your heart is ready for a new relationship, you will know. Give it plenty of time because grief can be deceptive - you may think you are over the divorce; but, you may not be deep down.
Most experts say that it takes at least one year after any traumatic event before you are truly ready to make any important decision. If he really loves you, he will wait until you are sure you are doing the right thing.