What counts as part of your word count? (EPQ)Watch this thread
Edexcel doesn't have a hard word limit but say: It is estimated that the dissertation produced will be 5000–6000 words in length. Learners will not be penalised for producing work outside the suggested word count, but they should ensure their word count allows them to meet the assessment objectives.
I've known people write over 20,000 words and get an A* although they didn't endear themselves to the person marking it.
However, the general (non EPQ guidance) for an abstract is that it should be 150-250 words. People don't want to waste their time, effectively summarising your work into a few words is an important skill to learn and to demonstrate here.