It's tough, and it is getting harder the more subscribers there are. It's because the expectations are higher, I feel like the quality of the videos have to be higher, more engaging, and always have fresh ideas down the pipeline. Because you don't want to disappoint the subs by releasing crappy videos.
I also have this fear that if the schedule or quality drops and the views drop, the channel will lose authority and start to degrow, so there is the pressure to keep it up. Professional channels in our genre have set an incredibly high standard of quality and creativity, and the only way to get to those levels is to have equally awesome content. That takes a lot of time.
Finding the time for all that is challenging, especially with my wife working full time and 2 kids and schools and all the other things going on. We usually film in batches, so last time there was good weather the car was fully loaded with plush toys and costumes, and the kids off to the parks for filming. Then the videos are processed over the following 1-2 weeks. It's basically a 24 hour operation at the moment, so we can be filming at 9pm before bed or 6am before school and the videos are processed and rendered overnight. Daytime is toy hunting, researching, cleaning, prepping, sleeping.