- Increase epoch times to give the miners a chance to see each other's
blocks.
- Wait longer for a multi-block tipset.
- Reduce the initial wait (we're increasing the block times and I don't
really feel like waiting around).
Now that this API is _much_ faster, we're more likely to "catch up" to
the head faster than it can stabilize. I'm pretty sure the test was
intended to be written this way anyways.
