He's only been back about a week, maybe more, maybe less. Definitely long enough for him to lose the tan he got in Mexico, but still be thankful for the warm early-summer weather in London, a blessing after the long cold winters of Sweden and Russia.
In all honesty, Lionel's not exactly sure how long he's been gone, but it's got to have been around a year or two. It doesn't really matter, he thinks. It all looks exactly the same here anyway. The same frightened looks on everyone's face, the same death counts in the Prophet every Sunday. The same mark burned into his arm.
Lionel had told Dumbledore he quit. Was just too tired of fighting anymore, way too tired, but, upon hearing Lionel was back, the Headmaster had requested Lionel come to one more meeting, just one more before he can officially go his own way, with the Order's blessing. Lionel wasn't excited for it, but it must be done.
He steeled himself outside of the Order door, took a deep breath, and then entered.