The only way to actually know how long it takes to plot is to try plotting with your own equipment.
That being said, there are rough guides that can tell you what might be possible, plus a multitude of user experiences within the multi-verse of hwd setups and configuration here on this form, plus guides to be found on Chi’s own sites, youtube, individual websites, commercial website, reddit, and the like.
Variables affecting plotting are many and convoluted, including your own budget, plus skill and perseverance testing and the various plotting sw available, and matching that to hw available for purchase.
Of course, one can take the easy-peasy way out and just purchase plots ready-made. However, you’ll still need to come up with an efficient farmer PC.