Am I reading you right? Your long run is 20 miles and you are hoping to get it to 30?
I would stop at 20, possibly 22 max and even then only perhaps once a month. Slow is good though. I would try and squeeze a medium long run (say 10 miles) in once a week if you possibly can. Some sort of speed work is good, I do Parkrun too but as part of my 4 runs a week schedule. I don't have a marathon on the horizon so I am only doing 20 miles a week in total. That will start to build next year.
Park run this morning on Wimbledon Common. Soooo muddy, it's like it is still February. No wonder the tennis is behind schedule. No PB today, way off the pace. Even without the mud I don't think it was going to happen today. Still recovering from the holiday!
Sounds like you are sort of doing an extended warm up JCG.
Back in the UK after 2 amazing weeks in Andalucía. Fantastic scenery, architecture food and drink. Despite quite a lot of walking my first run back home was a little slower than before given my threshold heart rate.
Didn't want to come home for many reasons! Mrs Road Runner almost refused to get on the plane. After last Thursday we tried to pretend we were Dutch not British.