This is the 1750th most frequent Polish word.
tygodniach
"Of weeks" (locative or instrumental form).
tygodniach means 'weeks', here used in the locative case to indicate time within a plural 'weeks'.
W najbliższych tygodniach będziemy podróżować po Europie.
In the upcoming weeks, we will be traveling around Europe.
tygodniach means 'weeks', used here in the locative case indicating a period of time after a referenced point.
Po kilku tygodniach oczekiwania otrzymaliśmy wyniki.
After several weeks of waiting, we received the results.
tygodniach means 'weeks', again in the locative case, referring to the time within the plural 'weeks'.