I'm quite a fan of plugs, have used many of various makes and textures and of course sizes over the years. My favourite is a huge curved one designed for men (it hits the prostate) but feels wonderful for a woman, however I do need alot of lube with this, a good oil based one. With my smaller plugs I can insert them with either my own juices or a little spit, but it's taken a fair amount of training to get to that stage!

As for how long to wear them, I've also had mine in (the smaller and medium sized ones) for very extended periods of time, at one point a whole weekend, only removing it for nature calls.