Out of the Norm Kick Count?

34 weeks. I do a kick count every evening after dinner. I time how long it takes to get to 10 kicks using the Count the Kicks app. Average time is 8 minutes. Tonight it took 26 minutes. Way longer than it usually takes. I had an NST this morning and everything was perfect. Is this out of the norm kick count anything to worry about? Or should I only really worry if I don’t feel many kicks in 1-2 hours? Thanks in advance!! Keep meaning to ask my OB this question but forgetting. 🙃