To complete the Bachelor of Engineering Honours (Flexible First Year) you must undertake 192 credit points (cp) worth of units (ie, subjects), which will take 4 years of full-time study.
A typical unit of study has a value of 6cp. Full-time students normally enrol in 48 cp worth of units each year.
Students undertaking the Flexible First Year program enrol in a common set of units in the first semester, then choose which of the engineering streams to pursue. Your detailed course structure will depend on which stream you choose to study.