If it will stress you out to the extent that it may impact your performance on the day, I wouldn’t. But in terms of prep, I think 10 days is more than enough. Assuming you researched the firm prior to applying, things like going over your application to see what you mentioned, thinking of examples for different competencies, any developments in news stories you’ve been following, brushing up on basic commercial awareness (business risks, factors a business needs to consider when expanding, in what ways law firm practice areas are involved in transactions) wouldn’t take you up to 10 days imo. Feel free to pm me and I can send documents that helped me in AC prep. I didn’t apply to HSF though, so I don’t have any specific advice.
I thought everyone knew Paul from Shearman 😅