When I last worked with coatings of ECP, the product was using emulsions similar to the RA paper but was about 1 stop slower than the paper due to being coated on film support. That is where I got the speed estimate. So, under ideal conditions, I made a guess based solely on the paper. IDK how much you have lost due to keeping, but I know that this product does not keep well if it is similar to what I used to use (and coat).