Its takes few days to heal, unless you hVe hard stools or straining again, which makes it open wound again.
Homeopathy helps in fissure and digestive issues. Please consult an MD homeopathic doctor near you.
Next Steps
apply vaseline 3 times a day.
Health Tips
try to have a diet which has decent amount of fibre but not too much fibre.
sweet fruits like papaya, figs, banana, mango, chikoo are useful