This is the 7497th most frequent Turkish word.
günleri
"Days" (plural form).
"Günleri" refers to days of a specific category, in this case, 'iş günleri' (workdays).
Hafta içi iş günleri çok yoğundur.
Weekdays, workdays are very busy.
"Günleri" highlights specific days associated with holidays.
Bayram günleri birlikte kutlanır.
Holiday days are celebrated together.
"Günleri" is used to refer to a nostalgic period of time, 'those old days'.