It depends. It typically takes longer to be matched with a surrogate than to find a donor. Many intended parents opt to match with a donor and do the egg retrieval while they are waiting to be matched with a surrogate. This allows the parents to know that they have embryos frozen that will be ready for when the surrogate has completed her screening. If you plan to do genetic testing on the embryos, this requires that the embryos be frozen. As such, there no reason to wait until you are matched with a surrogate to do the egg donor cycle.