ditto on what cynic said. but 10caps is a good average number when specific serving size and EPA/DHA quantities aren't known.
Most caps are 1000mg, but some are 1200mg and I think they even make 1500mg.
also, flaxseed oil is, arguably, a lot less effective than fish oil. flaxseed contains ALA, which the body must convert into EPA and DHA. some people aren't very efficient at this...lacking good quantities of the enzymes that do it.
and in general its not an efficient process to begin with, something like 15-20% turnover. when you consider about half a fish oil cap is EPA and DHA (500mg), vs only getting 20% if it were flax (1000mg * 20% = 200mg), that's over 2x as much flaxseed oil needed to get the same fatty acids. which means over 2x as many fat calories needed...and that gets counter-intuitive pretty quick.