What is your Service?
How much Chapter 1405 time do you have in addition to your 17.5 years of Active Federal Service (AFS)?
As you probably know, for non-disability, you get Regular Retirement after doing 20 years AFS (retired pay immediately), and less than that you get your RC Non-Regular Retirement (retired pay at age 60 unless you have AD time that qualifies for a reduction - max it can be reduced is to age 50 I believe).
So the para-legal is not necessarily wrong. But it is more complicated.
With military disability, they allow you to add your Chapter 1405 time to your AFS time (the time at retirement- after the whole process) to get the 20 years. Hence the importance of knowing your Chapter 1405 time....to see how close you are to 20 years with that added in...considering the whole MEDBOARD process could easily take over a year and add to your AFS.
You really want to have it over 20 years (AFS + Chapter 1405 time) when the process is all said and done. The obvious is getting the retired pay immediately vice waiting. Second is you would NOT qualify for getting CRDP if granted a disability retirement with less than that 20 years...so you wouldn't get both checks (though there is CRSC that you may qualify for that could help and I think once you reach the age for non-regular you would then get CRDP...regardless, still not an optimal outcome). Third, having over 20 guarantees disability retirement regardless of DOD% (so no worry about Disability severance pay if 10% or 20%...lump sum check) (though I am not sure how those rules work with the fact that you already have earned non-regular retirement. Others can chime in on that).
I know in the Army, the regulation guarantees Secretarial Review for cases Over 18 years AFS (which you should hit) and Less than 20 Years AFS. Basically the SECArmy can decide to retain you on Active Duty and then grant your disability retirement when you hit 20 years AFS.
Not sure what the other services do, so hence why asking.
So there is more to this whole story than the quick answer you probably got from that para-legal....