Remember that's how long he can hold it in a single go if Obito turns it off and on his time restarts each flicker so Naruto would have to constantly and viciously attack him at high speeds so Obito couldn't risk turning it off.he can only use it for about 5 min so if naruto countinuosly attks him he might have a chance
I don't think rinnigan can absorb space/time tech.Rinnegan users can absorb it if they have time.
its possibul high difficultyRemember that's how long he can hold it in a single go if Obito turns it off and on his time restarts each flicker so Naruto would have to constantly and viciously attack him at high speeds so Obito couldn't risk turning it off.