Teething timeline?

Kailey Suzanne • Hazel Suzanne 02.18.18 - Colbie Margaret 08.09.19 - Baby girl #3 due 05.28.21

Help! Baby girl has been having teething symptoms for a while now.. she starting showing white through the gums on one tooth yesterday and has been MUCH more fussy - especially at bed time.. Is it going to pop through soon? Or is this suffering going to last a while? How long does it take from showing through the skin to breaking through?