Pullets will usually lay continuously for 13 moths from the point of lay before undergoing a full moult. They may have several mini moults during that time though. The number of eggs laid varies by breed and genetics. Once mature, a hen will usually moult once per year, beginning anytime between late summer and late fall. During a full moult, the hen will cease laying altogether. You will notice color coming back to her cheeks, beak, shanks, etc.... in addition to the replenishing of feathers.
Thank you so much you have answered my questions! See my hens resumed laying the end of Dec and I have gotten up to 9 eggs out of 12 hens in a day, now I am lucky if I get 4 or 5 and am seeing feathers around and my roosters driving them nuts. Just wondered if that could be going on or if the nicer weather is making them lazey