@FairWeatheredFriendCould do a story like that to we're the clones aren't permanent and when they get recalled back to the main body he gets to "retain" all the knowledge and info that the clone experienced in the day it spent out of body, in essence making the MC op as fuck.
A way to do just that could be through very limited time travel. The ring grants ability to go back, say, up to 8 to 24 hours in the past.
Multiple copies are achieved throughout recursive jumps, limited by the cooldown time on the ring that's a significant part of the backsliding window, and can be even directly proportional to the last jump. So, say if you go back 18 hours, you can't go back in time for 12 hours.
Additional difficulty could be that copies merge if he meets himself (so no side-to-side fucking a row of girls).
Through experience and training the control of various variables may or may not increase, the precision of backwards jumping, the max time limit, the cooldown decrease.
A complete gamification of the experience could be if he have to consciously define return points before he can recall those, it's that function that has a cooldown (fixed and relatively short, say 1 to 3 hours), each return point can only be used once, and they expire in the set time, with could be slightly longer in this model, say 48 hours.
There could be additional limitations on the number of concurrent copies or some discouraging costs of overdoing it into infinity.
ETA: Obviously, this is likely kind of time travel that can only affect causal flows that are not yet part of your previous experience in the future, so known facts remain immutable, but may be open to interpretation. (But still can include paradoxical experiences where you learn about your own future actions in the past before deciding on a jump back.)
And yes, there's no fast track going back to future (other than self-merge, maybe), you simply live past the point you left earlier.
