I am doing a research of the processing times of papers published in journals in my field. I have noticed that the metrics that the journals advertise (e.g. the Elsevier journal insights) do not correspond to my experience, nor to the recently published papers, so I wanted to make my own survey. (My guess is that they take into account papers which are immediately rejected by the editor without being sent to a review, so the average looks quite favourable. I am more interested in the average time of the papers which are actually accepted.)
I plan to cover all recently (last 12 months) published papers in 10-20 journals of different publishers (e.g. Elsevier, T&F, Wiley), which will result in hundreds of papers. Basically, I will take the date when the paper was submitted, accepted, and published online, and calculate the average per journal.
Is there a way to automatically extract this information?