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about 8 hours. Got a 7am train out of Clapham Junction and was home by 6. Very dull down to the SDW, hard work on the SDW then can't remember the way back but I think it was beautiful.
Quite a lot of walkers (it was a sunny sunday) so my one piece of advice would be to take a bell.
Utterly agreed with @leggy_blonde on the SDW. But it does have some good cafes
This was much better if you're after a long day out (but on road) http://www.marcusjb.com/cogidubnus-200
The south downs way will be shit. As long as you get thought that you'll be fine
I did this in a day last weekend https://bikepacking.com/routes/downs-overnighter/ and it was like a mini King Alfred's Way if anyone wants a shorter version