I am sorry to welcome you to our NICU "club", but glad you found us. Congratulations on the arrival of your precious little K'Lynn! It sounds like she is one tough cookie, having already graduated to CPAP.
As you've already discovered, having a baby in the NICU can only be described as a roller coaster. Please know that there are many here who know the incredible range of emotions you will be experiencing in the coming days and weeks, and are here if you ever need a listening ear or a shoulder to cry on. Being two hours away can only intensify the stress, I'm sure.
As for how long she will be there, that will depend on how she is progressing as the weeks go by. Generally they tell you not to expect her before her due date, though many of our members have had their babies come home sooner. Both of my preemies did very well, though neither was born as early as yours, and both came home at 35 weeks gestation. Our hospital expected them to be maintaining their own temperature in an open crib, having no apnea/bradycardia spells, eating and growing well, etc., though every NICU is different.
How are YOU doing? Do keep in mind that preeclampsia can strike up to six weeks postpartum, so keep an eye on your pressures. Here is a helpful list of things you should be watching for: http://www.preeclampsia.org/symptoms.asp
Please feel free to ask any questions you may have, and do update as time permits. I will be thinking of you, and hope that K'Lynn continues to do well and progress so she can be home with you soon.