How long can it be until lumps, divots and swelling subside from a facelift? I'm at 7 months and still plagued by these.

I'm not sure specifically what you're referring to but significant contour issues should be gone within a few weeks after a facelift let alone seven months. Discuss this with your surgeon.

It can take up to a year for wound maturation to occur but there are additional options for short-term improvement such as synthetic fillers for depressions and steroid injections for firm/raised areas. It sounds like you have been following up with your surgeon and I would recommend you continue to do so until they feel nothing further can be done. Hope that helps and best wishes, Dr. Donath 

Its not uncommon to have some of the concerns you posted for a month or two after surgery.  But those should have resolved by seven months post surgery.  About the only thing that will still improve at this point would be residual areas of numbness, as well as more formal maturation of scarring.  The steps you have taken like ultrasound or massage are great ideas but are not likely to do anything significant at this point.  Discuss your concerns with your surgeon and if you don't get information that helps calm your anxieties then seek additional information with other surgeons.