Can you have 1 very long contraction?

Jenn • Happy wife 👫, SAHM with my 2 yr old son 👦, baby number 2 due in September, it's a BOY 👶!
This is the 2nd time this has happened. Last night I felt a contraction coming on, took a warm bath & bam it came on strong. I was in so much pain that I was on the floor in a ball & even puked from the pain. Last time this happened I went to L&D  and as soon as I was in the parking lot it stopped. I did go in to get checked & everything was fine. They basically told me it's normal to start feeling contractions as long as they're not rhythmic and I didn't have to come in unless my water broke, was bleeding or they were coming constantly. My question though is I seem to have only 1 realllyyyy long contraction rather than small ones. Long as in lasting about 20 mins. Is this normal?