Hello Gay,
I can't answer your questions about time scales for delayed recon as I had my MX,ANC and Diep together.
However I believe some of the physical criteria for Diep recon are, previous scars on the tummy, being considered over weight, or too slender. Smoking, as it cuts down your healing abilities. With all plastic surgery it seems the patients expections also play a part, as further surgery to the healthy breast may be necessary to achieve symmetry.
As to recovery, post op I was 24hrs in ICU, 5 days in my own room, and up and walking straight 2nd day after surgery. It was difficult to get in and out of bed, but tramadol eased the way. I had five drains, all removed before leaving hospital.Once home I gradually came off painkillers and took it easy. I am now 5 weeks on and back to driving, wearing jeans, and doing most things domestic, but not lifting heavy weight. My tummy scar has healed very well and the new position of my belly button is looking good. I have been very good and worn my nhs tubular corset day and night

, swapping it out for light control M&S pants occasionaly. My breast scars have been slower to heal, but are on the way now. The new boob feels very firm, but I am assured it will soften in time.
If I had my time over would I choose Diep? Yes, my new breast is my own tissue which is important to me. My surgeons did a great job, and I had a good recovery.
Hope I've been of some help. Virtual hugs to you too.
Suzy