It's too long for me to wait.
When will I end this boring wait?
My waiting is endless(timeless), when does the end come?
“wait too long” can not express “漫长”very precisely, it is better to day endless or timeless.
I have been waiting too long.
when my waiting would come to the end?
I have waited too long./It's so long of my waiting.
When my waiting can get a end?