Unlike electrolysis, Laser-IPL only works on Anagen-growth stage because it's the only stage where hair is dark enough for light energy to be absorbed by the hair pigment. If you only did sessions in winter seasons, you could have been missing a lot of the anagen cycled hairs that grew in say in fall, spring, summer, but no one will be able to tell you 100%. The laser technicians should have explained this to you about hair cycles.
If you start electrolysis and only get treatments 3 months out of calendar year, don't expect to get fast results either. You have to keep on a consistent schedule to finish faster.