My horse recently twisted his fetlock and he seems to be fine and he's not badly lame. How long do you think I must wait before I can ride again?

Talk to your vet always. Always always ask your vet first.
until he is 100% sound
I would keep walking him,Put ice on as much as you can, control the temperature of both fetlocka as if its something bad the injured fetlock will be much warmer!wait some days, if it doesnt change then call your vet. Hope it was useful enough😅
Consult a vet before doing anything
I would wait one week and if u want you can work it to the rope very light 😊
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