[Visiting Eve] regularly.. what would be the point? You can do science even better with probes than with a manned visit - since a probe can focus on the science and not worry about stuff like life support or returning it's crew back to orbit alive; most of the weight on the probe that isn't used to decelerate, stabilize and land the thing can be power and science stuff.
I have a funny feeling that, when resource maps, extraction, and refining are implemented, down the road, Eve is going to be resource-rich to incentivize
pulling out all of your hair regular round-trips. It may well still be smarter to make those missions automated, instead of manned, but since KSP is being designed as a game, not a simulator, rewards are likely to be balanced against risks and investments.
I've still not time-accelerated the fleet to Eve. Currently, I'm faffing about with an unmanned lander, intended for Eve. I figure, better not to waste thirty-two days of in-game time, if I can potentially get my first lander design ready before the Eve-transfer window closes. I'm going to take this one out to Minmus or the Mun, first, for a test-landing, because I think the landing legs might be too stubby, and this is one that can't afford to have engines breaking off. If it works, I'll launch a couple of duplicates off to Eve straight away. If not, I'll do some tweaks, and the modified version will do its test landing on Eve.
Naturally, the lander is so large, that I had to drain its fuel into the lift stage to get it into Kerbin orbit. Thus, my refueling ships are getting another workout. The lander alone (i.e. omitting its interplanetary stage) requires about five small oilers to refuel from dry. I'm sending up two oilers now and planning on sending the lander out to the depot over Kerbin for the rest.
Going to Eve is the easy part. Talk to me when you get back
Pfft. Talk is cheap. I'll send you an advertisement from the brothel that my Kerbonauts will need to set up to properly harness their pimpness.