Five weeks... I wouldn't be worried about it unless it was in direct sunlight. Five months... I'd keep it somewhere pretty dark. I keep my carboys in my unfinished basement which just has small windows that don't let in much light. As an extra precaution, I cover the window right next to the workbench where my carboys sit with heavy cardboard. An added benefit is that it blocks my wine from view by any snooping neighbours who (in my shady neighbourhood) might break in and drink my hooch!!