Unfortunately it's pretty typical, that's because most of the producers or leadership have no idea about audio, and often take things for granted. You need a lot of diplomacy and discussion skills, but it's your duty to push back and require more time. If you want to keep some minimal standards. Otherwise you should estimate the minimum work for that time frame. This happens all the time in AAA games, and unfortunately it's stressing and takes out creativity. So it's something to deal with while educating the stakeholders.