Re-using the nonce – is this true?

Hi,

I’m sure this has definitely been discussed here before but I can’t find any posts.

My app makes multiple ajax requests to the server but the main page never refresh’s, so I need to be able to re-use nonces, or at least the nonce actions, and I need to do this securely.

My research has led me to 2 solutions:

1. says that nonces in wordpress last 24hrs so just reuse them scroll to comment by brenton
2. the other says to get the server response to give a new nonce back as json to my app Multiple ajax nonce requests

For example. Say a list of items, and an ajax delete button, that would need to be called more than once, is the correct use to send a new nonce back as a server request or just reuse the same nonce created at run?

Or is there another way to accomplish this?
thanks,
daithi