Yeah, I suppose if you have info from a coach, you're probably working from a reasonable plan, especially if it's a very knowledgeable, experienced coach. As you work in speed, I hope you're able to at least maintain where you got your mileage during marathon training and that you're able to ease back before jumping into speed. I usually follow a pretty standard 4-week recovery plan after a marathon (resume running 3-5 days out, depending, with the first two weeks very light), and start strides again around 18-20 days out, light progression runs ending shy of MP around 24 days out -- with the 5th or 6th week out basically back to my average mileage for the 16-week cycle. Then depending on what I have coming up and whether I'm trying to increase mileage, I usually have at least a few weeks where workouts don't get faster than HMP, and I'm ready to start another cycle of harder training around 8-12 weeks after the marathon. I doubt you'd be detrained enough after 3 weeks to really delay a recovery return schedule by much (and obviously extra rest and recovery can be very good, especially if you need a mental break or have to take care of some relatively minor aches and pains), but I hope you're ramping up at a good rate. Good luck.