Hi J nine,
Sheila did an excellent job of answering your questions, but I shall also give it a try.
The answers to your questions can't be so specific.
The rash usually scabs within 2- 4 weeks, but then you are left with dark red scars, that can take up to one year to turn into white scars.
The pain of shingles can leave when the rash leaves, or you can have Post Herpetic Neuralgia PHN, that can last a couple of months or literally the rest of one's life.
If the rash (ie vesicle-blisters have scabbed over and fallen off) and pain are completely gone, and symptoms are gone, such as fatigue, exhaustion, malaise, aches and pains, swollen lymph nodes, head aches, chills and sweating are gone, the shingles is considered over.
However, many individuals are left with Post Herpetic Neuralgia PHN, and then Shingles really isn't over.
If an individual gets a rash on their face, the onset of rash is usually up to five days, but can last as long as seven. If the individual gets another rash in another area two weeks from then, it is considered a new episode. If an individual keeps getting rashes in different areas one after another, in different parts of the body, it is considered disseminated Herpes Zoster-Shingles, and s-he needs to be hospitalized. This is not normal!
One rash for each onset of episode, but you have vesicle-blisters occurring in crops or waves over a period of 5-7 days.
You can definitely have Herpes without the Rash, or "Zoster Sine Herpete. ". Usually, you have other symptoms such as: fatigue, exhaustion, malaise, aches and pains, swollen lymph nodes, head aches, chills and sweating.
I hope this helps you.
Best Regards:
Merry Juliana