This depends on the severity and if it’s a recurring issue. If it’s an acute fissure and it’s treated within a short period of time, you should start healing in about five days. The full resolution can take up to two weeks. If no improvement is noted or if it’s persisting longer than what’s stated above, a thorough re-evaluation should be performed by a doctor.
With chronic issues and repeat offenders, the likelihood of improvement diminishes the more times a fissure develops. This should be noted on the initial examination and may sway the treatment directly to surgical options.