How long ago did Mourad steal the horse in "The Summer of the Beautiful White Horse"? What was his response to Aram's question?

According to the story, Mourad stole the horse a month ago. However, Aram didn't find out about it until the morning Mourad showed up with the horse at Aram's bedroom window.

When Aram realized that Mourad had been taking early morning rides for quite some time, he began to question his cousin. Aram wanted to know when Mourad stole the horse. However, Mourad sidestepped the question with his own question: 'Who said anything about stealing a horse?' Basically, Mourad didn't want to admit his culpability for the theft of the horse. To him, it was imperative that a member of the Garoghlanian family should never be accused of theft.

We only find out that the horse has been missing for a month because of John Byro's visit to Aram's home.

Then another visitor arrived, a farmer named John Byro, an Assyrian who, out of loneliness, had learned to speak Armenian. My mother brought the lonely visitor coffee and tobacco and he rolled a cigarette and sipped and smoked, and then at last, sighing sadly, he said, My white horse which was stolen last month is still gone. I cannot understand it.

In the end, because of John Byro's magnanimity, Mourad and Aram quietly return the horse to the farmer's barn.