Even ignoring the downtime between singularities, there was a year (iirc?) between the conclusion of the Temple of Time and the Foreign Gods’ invasion.
Se.ra.ph was essentially retgonned.
Shinjuku was less than a week.
Agartha… Okay, there was travel time and whatnot. Maybe a few weeks.
Shimosa was a few days. There’s… four night time scenes?
And Salem was maybe two weeks. As well as a major reveal of something mysterious going on to the world in general.
A week long race across a desert/staging a prison break.
And a week descending into the Babylonian underworld.
That’s still the better part of nine months between Solomon and the big Freeze. Is the MC just resting on his/her laurels? What are the staff doing?
There’s a whole world of magecraft to explore, and you finally have some downtime!
Even if most of the servants aren’t any help and/or unsummoned (and they were around to rayshift to Salem, so it’s not like they’re gone in the first few weeks), at least one Caster could have given them some pointers. Or EMIYA. Even just the basics of physical magecraft?
We don’t really have any good examples of an average magus in the Fate franchise - Shirou is… overspecialised, Rin’s a Prodigy, Sakura has worms, Luvia’s a bit part and likely prodigy… Apocrypha’s Yggdramillenia are specialised, the entire Prisma timeline(s) is shenanigans, and even the Case Files are special snowflakes, but a year should be time enough to pick up something.
And three months in the Shadow Border with literally nothing else to do.
I’m not even expecting going toe to toe with the Oprichniki created by the sleeping Ivan’s Noble Phantasm levels of competency. Just something beyond ‘standard human with a Mystic Code that does X, Y, and Z.’