having a year of experience and film at the collegiate levels keeps your options open more if things were to change at your school. It can also help solidify your future role/spot with your current coaches..
You can also develop more physically to improve your baseline prior to taking a step back. But mainly since nothing is guaranteed at that level and after that absence it at least checks the box that you did it (played D1).
Worse case scenario is you are squeezed out, coaches change, etc then you're facing an uphill battle if you're scrambling in this environment to latch on somewhere with your last game film 2-2.5 years old and with schools knowing you're likely to be a project physically/mentally.
To your question, I think it's 6-12 months before you're back with a lot of variability there.