expression
from beginning to end; from start to finish; all the way through
Emphasizes covering the entire span of something, often used with verbs like 読む, 見る, 説明する, or 楽しむ.
その映画を最初から最後まで見た。
I watched the movie from beginning to end.
彼は最初から最後までずっと黙っていた。
He remained silent the whole time, from start to finish.
ずっと means 'continuously' or 'all the way', but does not explicitly mark the start and end points like 最初から最後まで does.
A straightforward compound of 最初 (beginning), から (from), 最後 (end), and まで (until).