@ irockoo7 Presently I'd say about 2 years depending on a few factors like your LPC/OPC grades.
Minimum requirements to upgrade are; (amongst others)
- 4,000 hours total time;
- 1,000 hours B737 time including a minimum of 500 hours in flydubai aircraft;
- Two successful OPC/LPC check rides with flydubai;
Minimum 12 months in flydubai since successful initial Line Check
Some guys choose to upgrade as quick as possible whilst others delay it to enjoy the better rosters due to their higher seniority in the right seat. I know quite a few who upgraded between 18-24 months.