Basically, you have to distinguish between the pure printing time and the time for the entire process. Of course, the cells have to be grown over several weeks or months. When printing an organ, these would then have to be dissociated and made available in time. After that, a more or less automated material feed would still significantly affect the overall time. It would be crucial to be finished with the entire process before cells die due to inadequate supply after several hours; however, this time span can be extended biochemically.
The pure printing time can be estimated as follows: A 100-kHz laser and 10 cells per droplet can print one million cells per second, or 3.6 billion cells per hour. Since the laser repetition rate can also be higher, and the average cell count per droplet could probably be slightly higher than ten for many organs, this number could be even higher; especially if more than one print head is used.
For organs, total cell counts are reported to be in the single or double-digit billions, so that would translate to a few hours of pure printing time. This is a simple estimate and currently not feasible, but it shows that with further optimization and automation, printing entire organs is not unrealistic in the future.