hydra/src/main/services/download/helpers.ts

export const calculateETA = (
  totalLength: number,
  completedLength: number,
  speed: number
) => {
  const remainingBytes = totalLength - completedLength;

  if (remainingBytes >= 0 && speed > 0) {
    return (remainingBytes / speed) * 1000;
  }

  return -1;
};