=(NETWORKDAYS($AF2,$AG2,Lookup_table!$J$2:$J$10)-1)*("19:00"-"7:00")+IF(NETWORKDAYS($AG2,$AG2,Lookup_table!$J$2:$J$10),MEDIAN(MOD($AG2,1),"19:00","7:00"),"19:00")-MEDIAN(NETWORKDAYS($AF2,$AF2,Lookup_table!$J$2:$J$10)*MOD($AF2,1),"19:00","7:00")
can anyone pls explain and understand me how this...