It is acceptable to perform an afternoon
bedikah anytime from the beginning of
minchah ketanah until
sunset.
Minchah ketanah is two and one half
proportional hours before sunset. To check the local timing of
minchah ketanah and sunset, we suggest checking the exact times in
myzmanim.
Please note that, if a
bedikah was performed in the morning, an afternoon
bedikah that was inadvertently or unavoidably omitted does not invalidate the
clean days.