Easily put a long time and a lot of money. I have been at it for a year just on my face, neck and recently started on my 'happy trail'.
For my face and neck I did 6 laser sessions at $150CAD each, and I have lost count of the electrolysis, but am around 30 hours at $40CAD /hour. I have tried starting directly with electro on the 'happy trail' and it feels very slow, I have around 8 hours there alone and its still a battle.
In my mind, the choice between laser and electro is the density and darkness of the hair. When there are a lot of dark hairs than laser is better, once the density is down and/or the hairs are light in color, it's time to switch to electro. This has just become a weekly occurrence for me, and sometimes if feels like it will never end.
I found both my laser and electro techs based on referrals from other trans girls. Try finding some local trans support groups and ask, they probably know the best place in town.
good luck...
jenna!