These occupations include formal and informal apprenticeships that may last up to 5 years.

It was an informal apprenticeship.

Animating is still on an informal apprenticeship.

They did informal apprenticeships, and I found them mentors so they'd have influences other than mine.

Aged twelve he started an informal apprenticeship with a local coachbuilder.

He worked with the builder, and in this short, informal apprenticeship, he learned the art of stonemasonry.

Most artisans do not have school-based training in their craft, but rather learn it through formal or informal apprenticeship.

De Dominici describes the relationship between Gentileschi and Stanzione as an informal apprenticeship.

Felix did, of course, serve an informal apprenticeship before taking over the literary reins.

Unlike the fine arts, artesanía is created by common people and those of indigenous heritage, who learn their craft through formal or informal apprenticeship.