Since performance support is somewhat of a vague description for a training deliverable, this answer can vary much more than other types of training. Two main types of performance support we develop are job aids and quick reference guides. If the only deliverable you need is performance support, depending on the actual item itself, the whole process can take from 2 weeks all the way to 2 months. That doesn't mean they never take longer, but that's our average time. The number of items and complexity of the task needed for each item also determines the time it takes which is why it's always best to discuss with us your project needs so we can give you more accurate estimates.