Breastfeeding

Ok you guys have help me so.much on wening my 15month old from the boobies druning the day he only gets boobies at night and 8am for morning feeding ( we wake up at 530 to 6 everyday) so my question this time is how do i get him of the boobies at night my husband is about to be working 6days aweek 12 to 14hr days in 2weeks so the sooner i get him off the boobies the better and i 27weeks and 4days preggers to his bedtime is at 8pm thats when he gets them again but would love to have him off all the way by yhe 13th help mamas pic so we dont get lost