Auth token for lifetime ?

[tushar4monto]

Hello

I have generated Token and token Secret with main admin ( administrator ) user. Now I can call my custom api with auth 1.0 its working fine. I have used this oAuth in my IOS app so i need to make constant for auth token and token secret with hard code when app build so if there is any issue and i need to update token and token secret. then i need to re build app with new token and token secret.
So I want to know few things please help me.

=> This Auth Token and Token Secret will work life time ? or it will expired ?
=> It is possible to we can just validate Consumer key, Consumer Secret and nonce Same like woo commerce auth ( without Token and Token Secret ).
=> How i can generate same auth with my ios app ? have any library ?
=> I can use this token and token secret with all user ?

Thanks