My contractions lasted about a minute long every time. Even when it was pushing time they were still about a minute, just extremely strong lol. Every now and then there would be some that would only last 30 seconds, but most of them were a minute long. Hope that helps! If you're worried then I'd go get checked, but definitely keep counting those baby kicks.
To start with they should last about a minute and be spaced evenly apart. When pains do get to 5 minutes apart or before if you need pain relief then just ring your doctor and go in. I had same problem, my 1st my waters broke and my 2nd I was induced so kinda worried this time :) x