Four nines is not what I would be citing at this point. (That's less than an hour per year, so they burned that for next three decades)
Maybe aim for 99% first.
Otherwise a pretty honest and solid response, kudos for that!
If you like Primer you might like this Australian time travel movie also, but I don’t think it references 88 MPH either. It’s a kind of Eternal Sunshine vibe and also involves weird tech.
I always strive for 7 9s myself, just not necessarily consecutive digits.
This reads as if overall performance was an afterthought and this doesn’t seem practical; it should be a business metric, it is important to the users after all.
Then again, it’s easy to comment like this in hindsight. We’ll see what happens long term.