Could take a while dude, with my last a2 I took 2 months off - did loads of weights, boxing stuff, mtb'ing, hill walking, scrambling, bit of winter stuff, feel pretty strong now, and dead fitter than before xmas.
LL55's top tips lessonJust take the time to do stuff you didn't do before cause you were dead focussed on climbing.
Try some deep massage on the finger, and keep it mobile, the more blood you get to it the quicker it'll heal. Then ease yourself back into climbing, warm up for a good length, don't try anything that tweaks the finger too much, drink loads of water and tape up!
Thin tape, tightly around the a2 and a4 when you start back.
If you can, get out on slabby stuff, where you just need to palm off, and get your footwork up to scratch.
And
'ing will keep your fitness up and your mind on the job.