They'd laid some of the ground work for jumpin' between dimensions before I got there. We had to figger out how to find a crack then how to make a crack. Got easier when we found the time vortex source. From the time I started workin' on it 'til we got the right dimension...eight months. Had to try out several dimensions first and once we got the right dimension, we had to find the right time. That took a year.