No libraries will be shut in Peterborough but job losses are possible under new proposals.
The plans would see libraries open for 50 per cent longer with residents able to use self-service technology when staff are not there.
The 10 libraries in Peterborough would stay open for 386 hours compared to the 261 they are now.
However, the number of hours the libraries are staffed would reduce from 261 to 149.
No details have been given on potential staff reductions.
The proposals follow a public consultation last year which saw 5,110 responses from residents.
A second consultation will now take place on the new proposals with details to be announced on January 19.
The new model would save Peterborough City Council £350,000 every year and are included in its 2015/16 budget proposals.
A trial of the new self-service technology, called Open +, will take place in Central and Dogsthorpe libraries in February.
Councillor Lucia Serluca, cabinet member for city centre management, culture and tourism, said: “We have listened to what people have told us and used this to develop a library service for the future.”