The length of the recovery period after the completion of your goal event depends on how “worked” you got by doing this run. If you are feeling good a week later then it is time to return to some light training again. I’d start with 50% of the highest volume week you had before this run if you plan to begin training in the next week or so. A longer wait will require you start with a lower volume. With this reduced volume you should be able to maintain the fitness you built for several more weeks. If after a week of low intensity running your legs are feeling fully recovered then it would be smart to add in some intensity. Just 1x/week of the same high intensity workout you were doing before but starting with a volume of about 50% of your peak volume.
Taper a bit for other major runs by dropping volume 30-50% and DROP all intensity for the week prior to the big run.