Well, Stone's Delicious IPA uses Lemondrop and El Dorado late and dry. They work well together.
Lemondrop - Lemony/citrusy
El Dorado - Fruity/citrusy. Some people get a candy-like/Jolly Rancher character. Mixed with enough citrusy hops, it's less noticeable to me.
Sorachi - Lemony and herbal/dill. I wouldn't worry about getting the herbal character in this combo because El Dorado is strong and assertive. Solo in a saison, maybe a different story.
As for extraction time, you'll hear lots of differing opinions. I personally dry hop in the keg and leave the hops in to stay. Others dry hop in the fermenter as fermentation winds down. I feel like extraction is done in around 3 days at room temp, longer at cooler temps.