Depends. I manage one brand and we are close to 2x. We are VERY strong on Google though but most of the brand awareness happens on Facebook so I would say that as long as your ROAS on FB is at 1.5 and your ROAS on Google is let’s say at 4-5, you should be good.
If you are not strong on Google, then obviously I would advise you to be close to 2x to start making money. I am not sure if you can expect that after 3 months though. I would probably say that a ROAS at 1.2-1.3 is doable after 3 months but can prob take longer to reach 2. But then again, really depends on your brand and how successful it can be on FB. If after 3 months, your ROAS is not even close to 1, I would probably try other channels = Amazon or Google.