I would not now.

When I first opened, I made this mistake. Let someone have a later pick up time and not add to fees for extra time because it was few mins. Then next client needed same and it felt petty to deny their request so then there was two being picked up later.

Sure enough, few month later, client tell me that their hour at work changing and they needed to drop off earlier. Suddenly my day extended both ends of day. Not for long but still it happened. And a few month after that, same client needed later pick up and since they been having earlier drop off for free, they expected later pick up for free.

I say, think carefully. It potentially can of worms to give message that business hours negotiable. And ALWAYS charge extra for it other wise it becomes expected for free.

I would also say that it on a use it or lose it basis because sometimes, I would be up and ready to start day early as they said they needed and they not arrive until 15 mins after agreed time.

It took long time to get client all back to core business hours so I wouldn't do again because of ripple effect.