Doppler use

How often and how long are you guys using your dopplers? I don't use my often maybe twice a week but I used it tonight and had a little trouble finding it so I kept searching for awhile wasn't keep track of time but if I had to guess it was ten minutes maybe a little less. I did find it and it was a good 160 Bpm but now I'm worried I used it too long 😁 I normally only use it two minutes at most. As soon as I heard the heartbeat steadily I turned it off so most of the time was spent searching just want some reassurance I'm just being paranoid