We do this quite regularly. Our oven door is broken, so we can cook things way more consistently in the electric frying pan - and it's quicker, too.

We usually put the vegies in at the same time as the meat - but then we are usually only doing a small roast for 2-3 people. We'll get the pan hot, brown the outside of the meat all over, then turn it down, chuck in the vegies, put the lid on... turn the meat once or twice. Generally it will cook in 60-90 minutes depending on the size of the roast. If you've got a bigger piece and want it well done you could perhaps go a bit longer.

I have to admit that DH is the main cook here, so I'm really only guessing on times!

BW