My band has done three full(four hour) gigs in a day once...It was brutal. We do two a days quite frequently in the summer months. As others have stated, the playing isn't the hard part...the set up, tear down and travel between gigs is actually harder. Eating right and staying hydrated helps but it's not easy when you're strapped for time...
For me, my definition of a workhorse snare drum that is inexpensive is the INDe 6.5”seamless brushed aluminum snare.
Just a fabulous snare regardless of the price. The fact it is so reasonably priced is a bonus. I have owned a lot of aluminum shell snare drums ( new Yamaha RC, Ludwig 400 and 402, Noble and Cooley Alloy Classic) and I would take the INDe over sn6 of them. They are that good.
This ^^^^^^...My gig is a "Party type Variety band". 120 gigs a year. Everything from down tuned metal to new country to hair bands and pop divas and ballads...My Inde 6.5 aluminum does it all. It hasn't left the stand since I got it and that's never happened with any of my other snares. It's like a chameleon that just fits into it's surroundings.