In mitosis, the longest phase is:

Prophase is indeed the longest phase of mitosis, typically consuming 50-70% of the total cell division time. During prophase, several crucial events occur:
-Chromatin condensation: Chromosomes become tightly coiled and visible under a microscope.
-Nuclear envelope breakdown: The nuclear envelope surrounding the chromosomes disintegrates.
-Formation of the mitotic spindle: Microtubule fibers assemble to form the spindle apparatus, which will later separate the sister chromatids.
-Centrosome duplication and migration: Centrosomes, involved in spindle organization, duplicate and move to opposite poles of the cell.
-Pairing of homologous chromosomes: Homologous chromosomes (those with the same genes from each parent) come together and pair up.
-Crossing over: In some organisms, genetic material is exchanged between homologous chromosomes during this phase.

The other phases of mitosis are:
-Metaphase: Shortest phase, characterized by chromosomes aligned at the equator of the cell, ready for separation.
-Anaphase: Sister chromatids separate and move towards opposite poles.
-Telophase: Nuclear envelopes reform around the separated chromosomes, and the cell starts dividing into two daughter cells.

⚡Related Terminology:
-Mitosis: Cell division process where one cell divides into two genetically identical daughter cells.
-Sister chromatids: Identical copies of a chromosome, held together by centromeres.
-Homologous chromosomes: Chromosomes with the same genes from each parent.