what you can do

it is in general an ethical violation for charging frivolous fees. usually, fees are charged by every 6 minutes increment, (0.1 hour). but it depends on your fee agreement.

if you think that it is impossible to spend a hour on that 2 emails, then you can dispute the money. in the mean time, file an ethical complaint against him with the State Bar. Usually, State bar takes this type of complaint seriously, and he will be investigated.