“Onedaywithsixclasses”or“Sixclassesinaday”arecommonwaystoexpressthisinEnglish.

Ifyou’relookingforamoreformalorstructuredsentence,youcouldsay“Therearesixclassesscheduledfortheday.”

Justremembertokeepitsimpleandclear,sothelistenerorreadercaneasilyunderstandyourmessage.Thesephrasesshouldworkwellinmostcontexts,whetheryou’retalkingtoafriend,classmate,orteacher.