Feeding is too long! Need your advice

I thought that breast-feeding range from 15 to 20 minutes per side however my son seems to be latched on all the time it can take up to maybe 45 minutes per side. I am very exhausted tired and don’t know what to do especially I am going to work in one week and can’t even get the time to pump. What’s your all suggestions? Shall I take him off my breast after 15 minutes on each side and maybe get him used to the pacifier. Do you think this is the right way?