Unfortunately is pretty far from "less than 10 years", which I guess you got from the half life of tritium. Tritrium radiocativity, in the form of tritium retained in the plasma facing materials, does contribute in that order of years if done properly, but neutron activation dominates and it's unavoidable. The actual numbers are in the order of hundres of years, still a lot less than fission high level waste, but let's not make unreasonable expectations around fusion, please.

You can find here a good comparison in terms of radiotoxicity vs years after plant shutdown for a few designs in this article [1].

[1]: https://doi.org/10.1016/j.fusengdes.2018.05.049