Technically, there is no limit on how many attorneys you can have. That said, it is common for a donor to appoint between one and four attorneys.
We advise clients not to have too many attorneys, as this can cause problems if too many people are trying to make decisions on your behalf at once.
On the other hand, it is advisable to not have too few attorneys, as you could find yourself in a position where there is no attorney able to act (e.g. should your appointed attorney die or lose capacity themselves).