
Not urgent. Roots do not drill through sound pipe. They find water vapor escaping an already-failed joint or crack, grow in, then thicken and catch paper and grease. So this is really two findings at once: your lateral is broken, and a nearby tree found the break. The pipe defect is the disease and the roots are the symptom — which determines who you should actually be paying.
For the tree, watch, indefinitely. For the plumbing, days if you have an active backup, because sewage in a finished basement is a health and insurance problem that worsens hourly. Between backups, roots re-occupy a rodded line on a fairly predictable cycle; if your interval is shortening year over year, the pipe defect is enlarging, and you are buying rodding on a schedule that will eventually cost more than lining the pipe once.