all about luck i think
I was waiting nearly 6 weeks for base training.Days away from 2nd recurrent circuit sim
Id say allow 3 to 3.5 months from start of TR to start of line training ,as you also have rostered supernumary jumpseat flights that are compulsary.
Plan finance as required,and hope to get lucky with your base beacuse most of it is - pot luck,random stuff.