ApproximateTime Class

class ApproximateTime {
    [timespan]$Value
    [string]$Prefix
    [string]$Postfix
    [string[]]$Units
    static [string]Round([double]$Number, [string]$Unit) {
        $Number, $Half = if ((($Number % 1) -gt 0.25) -and (($Number % 1) -lt 0.75)) { ($Number - 0.5), '½' } else { $Number, '' }
        return ('{0}{1} {2}' -f [System.Math]::Round($Number, 0), $Half, $Unit)
    }
    ApproximateTime() {
        $this.Init((New-TimeSpan -Seconds 0), $null, $null, $null)
    }
    ApproximateTime([timespan]$Value) {
        $this.Init($Value, $null, $null, $null)
    }
    ApproximateTime([timespan]$Value, [string]$Prefix) {
        $this.Init($Value, $Prefix, $null, $null)
    }
    ApproximateTime([timespan]$Value, [string]$Prefix, [string]$Postfix) {
        $this.Init($Value, $Prefix, $Postfix, $null)
    }
    ApproximateTime([timespan]$Value, [string]$Prefix, [string]$Postfix, $Units) {
        $this.Init($Value, $Prefix, $Postfix, $Units)
    }
    [string]ToString() {
        [string]$result = switch ($this.Value.TotalSeconds) {
            { $_ -le 3 }      { "<5 $($this.Units[0])"; break }
            { $_ -le 7.5 }      { "5 $($this.Units[0])"; break }
            { $_ -le 47.5 }     {
                "$([System.Math]::Round((($this.Value.TotalSeconds - 2.5) - (($this.Value.TotalSeconds - 2.5) % 5) + 5), 0)) $($this.Units[0])"
                break
            }
            { $_ -le 75 }    { $this.Units[1]; break }
            { $_ -le 2700 }   {
                [ApproximateTime]::Round($this.Value.TotalMinutes, $this.Units[2])
                break
            } # 45 minutes or less
            { $_ -le 4500 }   { $this.Units[3]; break } # 45 minutes to 1.25 hours
            { $_ -le 173700 }  {
                [ApproximateTime]::Round($this.Value.TotalHours, $this.Units[4])
                break
            } # less than 2 days 15 minutes
            default {
                [ApproximateTime]::Round($this.Value.TotalDays, $this.Units[5])
            }
        }
        return ("$($this.Prefix) $result $($this.Postfix) ".Trim())
    } # ApproximateTime
    hidden Init ([timespan]$Value, [string]$Prefix, [string]$Postfix, [string[]]$Units) {
        $this.Value = $Value
        $this.Prefix = $Prefix
        $this.Postfix = $Postfix
        $this.Units = @('seconds', 'a minute', 'minutes', 'an hour', 'hours', 'days')
        if ($Units -is [array]) {
            for ($i = 0; ($i -lt $this.Units.Count) -and ($i -lt $Units.Count); $i++) {
                $this.Units[$i] = $Units[$i]
            }
        }
    }
}