Doubts on Login Flow

My friend logged in manually and sent me the final request_token, I after some 10-20 mins tried to use the request token to get access token but I could not(invalid credentials). I looked in the forum and found that the request token expires in 2 mins. Myself and my friend(who has the access credentials) cannot sit at the same time. Is there any way that we can just login once a day and then get the request token? Also, a single login stays active for many hours(i.e is there any fixed time such that we should login)
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