For what it's worth, I just met with a second concussion specialist in my city. Like the first specialist, he predicted a full recovery (but recommended avoiding any further head impacts). He was happy to hear that I'd taken the full four months since my injury off - he thought that this may have helped with the progress I've made thus far. We're tentatively looking at a back-to-work plan that would have me starting back in a month or so. Under this stepwise plan, it would take me a further eight weeks to get back to full-time status.