what is the earliest tourist but to Guibei water town? plan to stay night @ water town

1. can i book combo ticket includes cable car ticket via hotel in beijing 1 wk in advance or earlier? or where else?
2. tourist bus from beijing starts 0900, GW ticket booth opens 1000, carble care opens 0900 as per article, recent review indicated GW will be cleared 1430 now instead of 1600 to prepare for night walk. if i take the earliest bus get there around 110/1130, settle hotel probably start to climb GW after 1200/1230. that only gives me 2/ 2 1/2H GW. i don't think that's enough time.
3. is GW ticket good for 2 days if i stay water town?
its difficult to plan. thank you.