[kashunstva]

> mere centimeters or millimeters of gap between notes

Or fractions of a mm.

As the player shifts to higher and higher positions on the fingerboard the physical distances become smaller and smaller for obvious physical reasons. At the very highest positions, the distances are almost imperceptible.

I would add that there are positional anchors, more like reference points that act as proprioceptive aids. In 5th position, for example, the thumb rests comfortably along the upper ribs of the instrument. But mainly it’s by less explicit reference.

The practice requirements are basically what you’ve stated; my daughter is a violinist at well known pre-conservatory program and her professor requires 4-6 hours of practice a day. A seat in a major orchestra is the result of truly gruelling preparation.

[quartesixte]

You still have to leave the anchors when jumping position to position. And hitting the thumbs right where you need em is hard too.

Good luck to your daughter!