I've heard people say that the general rule is a week. But to be honest, I don't think I can do that because if I only do 1 session, my either hair turns Carrot Top orange (I have naturally deep black-brown hair) and I don't think I can live with that for a week. At best in 1 session it turns into a level 6 or 7, but I need to get it at Level 9 at the very least so I can dye my hair blue.

But at the same time I'm too scared to bleach my hair more than once in a day because my indiscriminate use of bleach in the past has definitely made the fear of chemical burns and follicle damage a real thing for me. Would doing a soap cap instead of straight bleach be any better if I decide to wait like, 2 days between? Granted I have avery dry scalp and I /think/ my hair's overall thickness was affected by my reckless bleach use. But I haven't dyed/bleached my hair in over a year now so my hair is practically virgin now.

But what is the minimum someone can wait, provided they do hair protein masques and deep condition like crazy?