1
I was in home all afternoon.
I was at home all afternoon.
Use at home after verbs such as be and stay: ‘I’ll stay at home tonight.’
Do not use in home when talking about being in the place where you live.
2
What time did you go to home?
What time did you go home?
Do not use a preposition before home after a verb of movement. We say go home, come home, get home, arrive home, drive home and walk home.