We (the committee) have experiences to conduct several International Conferences which the proceedings were published LESS THAN TWO MONTHS after the conference date, the selected published proceedings conference as link below.
Journal of Physics: Conference Series, Volume 2049, 2021 – IOPscience
Journal of Physics: Conference Series, Volume 1655, 2020 – IOPscience
Journal of Physics: Conference Series, Volume 1351, 2019 – IOPscience