Actually the procedure can be completed in less than 15 days with special interest. The issue regarding gum.can only be assessed by visual examination and if the situation is as bad as you say like boneless then extraction may be necessary.
Next Steps
go for treatment asap but do consult a periodontist in this matter as he could advise you better than general practitioners.
Health Tips
try to save the teeth by all means. find replacements only if necessary. implants are the best available option though a little heavy on pocket