You can take a bus from Hastings to Dymchurch via Lydd, Camp (opp Shelter) in around 1 h 57 min.
How to get from Hastings to Dymchurch
From Hastings Town Centre, Railway Station bus to Lydd, Camp (opp Shelter) then bus to Dymchurch, High Street (Car Park). 1 h 57 min £9. From Hastings taxi to Dymchurch. 38 min £68. From Hastings drive to Dymchurch. 38 min £5.