if you want always the same position then this will help you
var xdoc = XDocument.Load(PathOfYourXmlFile);
var companies = xdoc.Descendants("prayertimes").Select(c => (string)c).ToArray();
string value = companies[0].TrimStart();
string[] split = value.Split('\t');
string ouptut = split[9];
output string will hold 20:46 that what you want