I did it a few years back.
Downloaded some bhf route printouts, had to use my phone sat nav a couple of times at the end, only really got lost a couple of times.
Obviously a nice long midsummer day, stopped for food in Surrey hills & again bit further down. 3l camelback with electorolytes + water bottle
Large chunk of it is downs link ex railway line, bit dull when views are hidden, but good to get a pace up.
Was well worth it, no massive hills and plenty of places to get water/food
Great way to see the countryside, I got a bit distracted by trails in hurtwood, which I was regretting late in the day.
https://www.strava.com/activities/174027293