Hatun and Daughter of Christ discuss the Qur’an’s answer to the question: “For how long can a woman be pregnant?”
Muhammad’s mother was pregnant with him for four years.
Islam QA on the question of pregnancy: https://islamqa.info/ar/answers/140103/%D8%A7%D8%B7%D9%88%D9%84-%D9%85%D8%AF%D8%A9-%D8%AA%D9%85%D9%83%D8%AB%D9%87%D8%A7-%D8%A7%D9%84%D9%85%D8%B1%D8%A7%D8%A9-%D9%88%D9%87%D9%8A-%D8%AD%D8%A7%D9%85%D9%84
Qurtubi for pregnancy can be 5-10 years: https://quran.ksu.edu.sa/tafseer/qortobi/sura65-aya4.html#qortobi
Egypt’s Mufti talking about this (Arabic): https://www.youtube.com/watch?v=SLeW8agx9eI
If Muhammad’s mom was pregnant for 4years, then definitely his paternity is highly questionable. Most likely Looks like his mama was a cheat .