Hi Blister, good luck for april mate, I'm getting a bit itchy about having a crack at it too.
My long distance walking experience is like this. Before the Lyke Wake (in october) I was doing occasional 30 milers, my usual walks consist of anything from 10 to 25's. The Lyke Wake is the furthest I've walked continuously, this walk I did with my wife who'd never walked further than 25, She found it a bit more difficult than I did, mostly due to blisters though not the distance.
After doing the lyke wake I really didn't feel too bad, I was even thinking about a double crossing sometime or maybe having a go at the lyke wake run.
I've always been in to hiking but more so these last few years, I'm more of a runner, marathons, halfs etc, preferably off road but the amount of time spent out running to be prepared for long distance runs and balancing this with having two kids and starting a business it wasn't very practical anymore. I still do a few though, week after next I've got a half penciled in. I wasn't going to bother but you get a great long sleeved t-shirt
I know I can do more than 30 without burning out and realise it takes most of the fun out of these types of walks which are planned around the scenic views but I have this awful habbit of enjoying pushing myself. The thing with having a crack at the minster is it's not too much to ask for a lift home if I fail, I've a good mate who wants to do it in a day too so we'll push each other on.
I'd say if you can do a 30 miler you'll breeze the Lyke Wake, it's a fantastic walk, We did it usupported and pre arranged our pick up at the ravenscar hotel so once started we had no choice but to crack on and finish, the only thing I'd change next time would be to do it in summer as we finished it in the dark which was a bit crap, rather than just heading for the mast which you can always see we were constantly having to check the map and bearings for the final part.
Ogy