How long should I lunge my horse before I ride?

Because lunging can cause a lot of damage do 5 minutes on each side and then get on a work it out
It depends on the horse and how crazy they are that day. If your horse is super crazy and excited lunge her to get extra energy out and like @abbyloveshorses said until she starts to listen to your cues. Make sure she still has enough energy to get through the lesson though
Until you see her calming down and listening to your cues. You want to be able to bring her back easily, and she should be tired and listening to you well.
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