git remote add my-remote my-super-duper-protocol::some-sort-of-address-thingy
The nice thing about metric/SI prefixes is that they're generic multipliers, which can be used with any units we like. If you want to use them with day as the unit, you can just do that; nothing extra is required, and the meaning is clear (though unfamiliar!).
There is an alternative approach though: we could use prefixes for sexagesimal multiples (base 60). This has precedence, since we have a system of binary prefixes like "kibi" and "mibi".
For divisions, we can use the standard progression of "minute", "second", "third", "fourth", etc. to say there are 60 minutehours in an hour (or more generally, 60 minutefoo in a foo); that there are 3600 secondhours in an hour; and so on. Abbreviating "minutehour" to "minute" and "secondhour" to "second" when we're talking informally about time would be similar to abbreviating "kilogram" to "kilo" when talking informally about mass.
I'm not aware of any standard names for multiples (rather than divisions). My proposal ( http://www.chriswarbo.net/projects/units/prefix_factors.html ) is “prota” for 60x, “defter” for 60x60x, “trito” for 60x60x60x, and so on; as Greek alternatives to the Latin "minuta", "secundus", "tertia", etc. (which "minute", "second", "third", etc. are derived from). This Greek/Latin combo would match that of decimal, e.g. milli (Latin) vs kilo (Greek), centi (Latin) vs hecto (Greek), etc.
That would make an hour equal to protaminute, or one deftersecond.