the key word would be more an observer in regards to Citijet SOs (SO don't perform all the duties of an FO i.e they don't generally land or take off generally only cruise duties during as with Cathey pacific descrip of SO Duties
'
The primary functions of the Second Officer are to act as a cruise relief pilot, to monitor all facets of the operation and to support the crew. '
Cathay Pacific Airways Ltd - Second Officer, job in Hongkong, Maintenance
- SOs are generally employed on long haul flights - excuse me if I am wrong but most single european sector flights don't reach anywhere near) with enough hands on experience building towards the 1500 hr(as on financial ctc page)which would probably take 18 months.