Right now, approval of a disability claim normally takes about six months, although an expedited process is available for people with severe cancers like yours. As you mentioned, there’s also a mandatory five-month “waiting period” after the onset of your disability (as determined by Social Security) before the first benefits can be paid. Once they kick in, your ongoing SSDI benefit rate will be slightly less than your FRA rate. That’s because your disability benefit, normally equal to your FRA rate, is reduced by about 0.5 percent for each month you receive an early retirement benefit before you begin receiving SSDI. And after your death, your wife’s survivor benefit will be that reduced rate.