Time is pretty irrelevant for versioning, unless you have paying customers and you want to trick some into paying the full price for a minor upgrade (eg. Windows 98, FIFA 2015, etc.)

1.x tends to fulfil the original goals of the project. As long as there are some unfulfilled goals, it's still 0.x. 2.x, 3.x, etc. are breaking changes, often a rewrite.