Great question. Here's the red flag: any clinic that guarantees a specific number of sessions before even seeing your tattoo in person is lying. The number of sessions depends on: ink density (how heavy-handed the artist was), ink quality (some cheap inks contain heavy metals that are hard to break), your immune system, your age (older skin heals slower), and location (ribs have good circulation, so that's good). For a 4-inch black and red tattoo, a realistic range is 6-12 sessions. A clinic saying '6 sessions' might be using a very strong laser (Pico) and being optimistic. A clinic saying '12 sessions' might be using an older Q-switched laser and being conservative. The honest answer is: 'We'll do a test spot and see how your body reacts. We estimate 6-10 sessions, but we charge per session, so you only pay for what you need.' Avoid 'unlimited package' deals – those often mean they will use low settings to make you come back forever. Ask to see before/afters of similar tattoos.