I usually bath the dogs in the morning only because that is when I have more energy. After the bath is the drying and grooming for each of mine so it can take up to 1 1/2 hours or so. I usually don't let them air dry since I like to groom them after their bath to get their coat the way I want it. They love the time I spend with them bathing and grooming them!

In honesty it really doesn't matter what time of day you bath them if you are not letting them air dry. If they air dry then you need to take the following into consideration:

Will you let them outside wet (especially in the winter)? Will they have time to dry before bedtime?

Happy bathing!!!