Issue found with filming

Whilst doing some test shots, I have found a problem with the time of day I want to do my filming. I did some test footage at around 1 in the afternoon, however when taking one of the shots, I couldn't achieve the effect I wanted because of the sunlight creating glare on the window. Therefore, I will need to film later at about 3-4 however it starts to get dark around this time, which needs I must be careful about the time and lighting.