which one more accurate ? i 'm going to continue my studies by next June or i 'm going to continue my studies next June or i 'm going to continue my studies in next june

Do we say " 40 hour per week " or " 40 hours per week " Do we say " 40 hour per week " or " 40 hours per week "

new people i love knowing new people specially from foreign countries to know new cultures , languages and personalities