Re: How long does it take a cell to 'do' Mitosis?

In most eukaryotic cells, mitosis takes about 80 minutes. This varies between kingdoms, but is usually in the range of one to two hours. For most cells, the length of the cell cycle is determined by the amount of time spent in the growth phases, G₁ and G ₂, with M-phase (mitosis) and S-phase (DNA replication) varying insignificantly. So for cycling adult cells, like skin cells, division occurs about every 24 hours [ M Æ G₁ Æ S Æ G₂ Æ M], while early embryonic cells (which don't grow at all between divisions) take only 8 hours to complete their cell cycle [M Æ S Æ M]. When cells differentiate, they exit the cell cycle and enter G₀, a modified version of G₁ which cannot enter S-phase.

Molecular Biology of the Cell by Bruce Alberts, et al., Garland Publishing, Inc., New York & London.