about moviedb

i have a question about moviedb.org agent

do anyone knows how much time would it takes to reflect the change in Plex
if i edit something (like movie metadata) in the moviedb.org website?

it seems that the changes could not reflect immediately, is that true?

and, another questions

actually which metadata fields in moviedb.org exactly is retrieved into my Plex collection
if i choose “Movie Database” agent?
(i noticed that the pictures of the actor in Plex are quite the same as the pictures in the moviedb website,
but not the names sometimes)
how can i check it?

by the way, i am a japanese user

thank you