3 hours is scary. But you know you can run 2 hours fairly comfortably, so in fact it’s only the last hour you’ll be working hard and mainly running on tired legs, at know point will you be breathing heavily like at track. It’s also the mental challenge of just ticking off the miles. If you have time a point to point is great. One of my favourite marathon runs was going to Eastbourne for their parkrun. I made it with seconds to spare and I got there feeling so smug that I had run all the way from Hastings. Might take some planning logistically but just the sort of thing to consider. Hastings to Camber is another long run I’ve really enjoyed in the past, and if it’s windy, pick a route where you’ll have the wind on your back. Any problems with the rest of the schedule just let me know. You got this.