Hey there @SanyaCLAUSS! You *might* be able to get close by using multiple Zaps. Here is my idea, let me know what you think:
Zap 1: Trigger event to send the initial data into your Google Sheet => Google Sheet New Row action
Zap 2: Google Sheets New Row trigger (reading from Zap 1 sheet) => Delay by Zapier (1 hour) => Find Google Sheets Row action => Paths by Zapier => ...
Branch A: User Has Answered => Perform “Has Answered” actions
Branch B: User has not answered => Send SMS => Webhook by Zapier action (Send to Zap 3)
Zap 3: Webhook by Zapier trigger (catch from Zap 2/3) => Delay by Zapier (1 hour) => Google Sheet Find Row action => Paths by Zapier => …
Branch A: User Has Answered => Perform “Has Answered” actions
Branch B: User has not answered => Send SMS => Webhook by Zapier action (Send to Zap 3)
Zap 3 will continue to check once an hour until the user has answered the questions or will loop until they do or the Zap is turned off. After writing this all out, I am pretty sure you could do this but do give it a shot and let us know how it goes! =)