I see several possible approaches, if you really want to have that client. This easiest would be to just talk to them, try to find out what that "100%" is actu

I see several possible approaches, if you really want to have that client. This easiest would be to just talk to them, try to find out what that "100%" is actually REALLY all about and make them understand that from a technical point of view, 100% will add a lot of things to the project budget. A "100%" demand in a smaller project for a typical small-to-medium business will likely mean something different than "100%" in a project for the NYSE. So, talk to the customer and find out what it is actually all about and then plan and quote according to their actual needs. So, this makes it more a requirements-engineering type of problem, not necessarily a hacker problem. Or you just say "yes, of course" and tell them how super reliable the system is and then let the guys in legal work it out in the fine print and cover your ass.. but don't expect much happiness and continued business from that client then once they find out what's going on. But, in a more honest approach, maybe this is actually all they really want and need? Maybe it actually is enough for them to have someone to blame and pay some penalties for violating SLAs. Again, you need to find that out. Not a typical hacker-hacker-problem but surely an issue a hacker would typically encounter, even on a daily basis, and should learn to deal with.