Air layering takes about 3-8 weeks. My question to you is, what can it hurt to try? There's two scenarios where you possibly lose the inflos. You take cuttings now, or the air layering doesn't take before the plant goes dormant. Either way, same result. Or you could try air layering, and have success. Pretty much up to you. You do however, want to take cuttings while the plant is actively growing. Not when it's dormant. Good luck!