Emmanuel, For reference, you can search for lessons here quite easily, rather than asking questions without giving a specific link to a lesson or example from here.

 ‘Ces’ is not a pronoun. 

 Ce, cet, cette, ces + [durée] -là/-ci = that/those or this/these + [duration] (French Demonstrative Adjectives)

 https://www.kwiziq.com/community-guidelines

The 2nd link is to community guidelines - not sure why it is incorrectly described (at least as I am seeing it when posted)