User blog comment:GianG/Merlin characters ages/@comment-5674726-20141116000448/@comment-24492510-20141116152238

"Which interview? Could you post a link, please? 

Four days ago, I saw many interviews about Merlin and in one of these, it was said that 8 months passed between Season 3 and Season 4. I'll try to recover the interview.

Gwen states at the beginning of The Darkest Hour, Part 1 that it has been a year since Morgana betrayed Arthur so canon is very clear on the subject."

Gwen didn't say: "it has been a year since Arthur discovered Morgana betrayed him", but she said " it has been a year since Morgana betrayed Arthur". It is clear that a series lasts at least 3 months... (3 months + 8 months = 11 months). Therefore, I thought that it is reliable that 8 months passed between Series Three and Series Four.

