Subtitle Edit: calculating remaining time

// variante #1
double surplusChars = charPerSecond % maxCharPerSecond;
double optimalMissingTime = surplusChars / maxCharPerSecond * TimeCode.BaseUnit;
temp.EndTime.TotalMilliseconds += optimalMissingTime;

// variante #2
double msPerChar = 1 / maxCharPerSecond * TimeCode.BaseUnit;
temp.EndTime.TotalMilliseconds += surplusChars * msPerChar;

// variante #3
temp.EndTime.TotalMilliseconds = temp.Text.Length / maxCharPerSecond * TimeCode.BaseUnit;

see: https://github.com/SubtitleEdit/subtitleedit/pull/1694/files (not correct!)