Aww first time mom anxiety, I totally get it! Honestly, it really varies kasi, may kaibigan akong nag-stay at 2cm for weeks, tapos biglang tumalon agad, pero may iba naman na nag-progress slowly lang week by week, so walang exact timeline talaga. Best na i-ask your doc kung paano ang pattern ng cervix mo and kung may signs na of early labor na nararamdaman mo (like regular contractions, spotting, or water breaking), kasi that's what really matters more than the dilation number itself. How are you feeling otherwise naman?