It isn't really possible to give too much sun but what you might have to deal with is too much sun too fast. When introducing plants to full sun it is best to do it in stages, 1 hr a day for a week, 2 hrs, 4 hrs, etc. so that the plant does not burn.
The plant was probably introduced to sun too fast or the humidity is very very low(20's etc.) and the temperatures are very high(90's etc.). This can cause the petioles to have slight burns. Apply a little shade in the afternoon if this is the case.
Where do you live? My VFT and Sarracenia sunburn on hot fry days within a few hours of sunlight even here in northern california (east bay area). So I need to put a net to filter the sun when the forecast calls for hot days.