You are safe so long as you stay here. ✬

I'll help you so long as you do your best. ✬

What's taking you so long? ✬

You'll get there in time, so long as you don't miss the train. ✬

I am sorry to have kept you waiting so long. ✬

I'm sorry to have kept you waiting so long. ✬

I'm sorry I've kept you waiting so long. ✬

You shouldn't keep them waiting so long. ✬

All I can think about is next month's vacation. I haven't been on one in so long. ✬

Why do you take so long to eat? ✬