Mandy Moore details the makeup process for her This Is Us character, Rebecca, and how it sometimes required her to spend 3 hours in the makeup chair.

The series finale of This Is Us premiered on May 24, and marked the end of the multigenerational drama that follows the Pearson family in several different timelines.

Moore's character, Rebecca, is the matriarch of the family alongside her husband, Jack (played by Milo Ventimiglia).

Throughout the series, Rebecca is portrayed at several different ages, from 16 years old to 80 years old.

An older version of Rebecca is seen in season 6, episode 17, as the timeline jumps to 2032 while Rebecca is on her death bed.

Although Rebecca's age changes throughout the series, Moore continues to play Rebecca as opposed to hiring separate actors to play her at different ages.

Playing a singular character across several different timelines is certainly a challenge, and the extensive process of sometimes taking an hour just to make

Moore embracing the long days that sometimes became longer due to hair and makeup shows her dedication to representing a Rebecca that looks as close to the authentic age