It should also be noted that when greeting a soul, time passes as the Reaper sees fit: they can talk in the void of emptiness for what feels like years, and nothing will happen. They can show events in the past, and give glimpses into the future, to help give closure to the soul. They can life this time in real-time, too, effectively predicting generally up to 100 years. (Things like, "how will I be remembered?" and "How will my offspring do?" are what I'm talking about as giving closure by showing the future.)
However, once no longer reaping, a Grim Reaper returns to their life with only moments having passed. During their every-day life, they do have some perks: people they're close to have the "blessing of the Reaper", an effect that makes them less vulnerable to death in their lives, be it their own or relatives. (Less vulnerable, not immune to.)
They can't see the future, nor can they see exact time of death on individuals, but when looking at people, they have the ability to tell a general estimate of how long they have to live and a general idea of how they will die, but they don't know the specifics. These dates they see, in fact, are not even absolute: they're predictions off of how things seem to be going. (Reapers can tell, periodically, when there's an Omnicidal Maniac near victory by seeing the lifespans around them all going instantly down to near-zero, to give you an idea, and will just shrug it off as, "Not again!")
Death itself actually isn't that much stronger. Death gets to see the exact chronology of "important" figures, knowing when they will die, absolutely, without question be dead for real and forever. (Obviously, Death isn't privy to share that info, but has it all the same.) However, Death doesn't get to see the lives of every living person; Death is not omniscient. Instead, Death just gets an upgrade on the Reapers: instead of a prediction, "this is a probable event", Death, if Death wills it, gets to see, "This is what, if nothing changes, will happen". However, Death--just like Reapers--has to actively choose to use this; it is not an automatic passive ability.
Most Reapers tend to leave the ability on the majority of the time, but Death generally prefers not to use it.
So guess I only got 15 minutes to spare after all.