Just put these 2 controls to your VideoFullScreen.xml (after opening
<control type="label" id="1">
<description>Clock</description>
<left>460</left>
<top>15</top>
<width>800</width>
<height>5</height>
<align>right</align>
<aligny>center</aligny>
<font>font12</font>
<textcolor>grey</textcolor>
<shadowcolor>black</shadowcolor>
<label>$INFO[System.Time] ($INFO[Player.FinishTime])</label>
</control>
<control type="label" id="2">
<description>OSD</description>
<left>15</left>
<top>15</top>
<width>800</width>
<height>5</height>
<align>left</align>
<aligny>center</aligny>
<font>font12</font>
<textcolor>grey</textcolor>
<shadowcolor>black</shadowcolor>
<label>$INFO[Player.Time(hh:mm:ss)] - $INFO[Player.Duration(hh:mm:ss)]</label>
</control>
For skin.maximinimalism I use:
<control type="label" id="1">
<description>Clock</description>
<posx>1730</posx>
<posy>0</posy>
<width>24-col</width>
<font>smallStrong</font>
<textcolor>grey</textcolor>
<shadowcolor>-</shadowcolor>
<label>$INFO[System.Time] ($INFO[Player.FinishTime])</label>
</control>
<control type="label" id="2">
<description>OSD</description>
<posx>15</posx>
<posy>5</posy>
<width>24-col</width>
<font>smallStrong</font>
<textcolor>grey</textcolor>
<shadowcolor>-</shadowcolor>
<label>$INFO[Player.Time] - $INFO[Player.Duration]</label>
</control>



