I used a Kirby
in a huge church and another one in a multiple office setting. Those motors, I believe, can certainly stand it.
I also used a Hoover Guardsman in a massive church. Every Saturday morning, I'd install a new genuine bag (Hepa didn't exist then). At the end of the day, I'd replace the bag. WE started ordering in bulk.
The first Kirby had a shakeout bag. It was filthy.
The seminary had a Guardsman (2 actually), with shakeout bags. They were kinder to empty than the Kirby was. One of my carpenters used a newer Kirby to clean up jobs. Once, in MY house, he was happily cleaning away when, suddenly, the bag BLEW off......................spewing,(way past belching) dirt everywhere. KNOWING the house was full of HOOVER appliances, he was horrified, and tried, desperately not not let me be aware of his 'accident'. No such luck for him. I couldn't resist chuckling while he cleaned up the mess.
I'm sure you'll get great service/use out of your Kirby in a commercial setting.
John