Wondering the same question myself. Would like to hear the answer! I also have raised beds in NE Ohio...

I run soaker hoses every 12" in my beds and do remove them for winter. I can't speak to how long they will last that way, but mine have not clogged despite very hard water and are in great shape after two years.

There are too many variables to give you a specific spread rate, time to run etc. The soil tilth and porosity, the water pressure used (pressure regulators are required in many instances) , the hose diameter, the incline if any of the beds, the degree of level throughout the bed, the quality of the hose (not all are equal) etc. So it is something you have to experiment with hands-on until you learn what works with your garden.

All of that is why I much prefer using drip tape. Plus it lasts longer and is less prone to clogging - especially if you have hard water.

Dave

forgot to add, in the average 3' wide bed assuming level and with good soil (I'd never use sand) 2 hoses running the length of the bed should work. 4 hoses for a 4' wide bed. BUt keep in mind the delivery rate falls off the longer the hose so often several shorter lengths is better than one really long one.

Thanks guys - again I will cover with plastic so does this mean I need more?

As an added point to what Dave said, be prepared to marvel at how little water you get at the end of a long run. Leaky hoses and all that! You can ameliorate that somewhat by running a non-dripping supply hose to the far end and manifolding there a bit.

As for "miss some roots", roots will grow towards moisture so the threat will probably not be as bad as you might think. My soil is wicked sandy and water tends to go down, not out.

I already have a plan for end of run I plan to loop it around to splitter - both on same splitter so water comes from both directions! We will see if it works.