I'm old and work alone or with my wife, I sharpen after I get home and stack my days load of split wood. If I hit a rock or barbed wire in the woods. I use the spare saw for the rest of the day. If I hit something with THAT one, I go home. Mostly 044 24" blade, I carry a spare chain on a bar, but can't remember the last time I changed to one in the woods.
When doing volunteer storm clean up which is often all sawing, all day, I sharpen at lunch also. I use stihl stones in a Dremel. If there are other volunteer "sawyers" I pretend I don't have my sharpening tools with me, cuz sharpening their chains is all I'd be doing. And they'd ruin my Stihl stones faster than they sharpen chains.
When doing volunteer storm clean up which is often all sawing, all day, I sharpen at lunch also. I use stihl stones in a Dremel. If there are other volunteer "sawyers" I pretend I don't have my sharpening tools with me, cuz sharpening their chains is all I'd be doing. And they'd ruin my Stihl stones faster than they sharpen chains.