I might consider doing even smaller chunks. Maybe 5-10 minutes.
I do often lose drive or focus halfway through a task. I find it has to do with the hyperfocus and motivation burst that I sometimes get. For me, I try to help counter the blah by listening to music, making the task variable (i.e. having multiple things to do instead of just one), and also rewarding myself when it gets done. For example, I may need to clean the litter boxes, put away the dishes, and also take out the trash. I can do them in any order, so when I get bored of one I can do the other. But when I get all of them done, I can sit back and relax on my computer, watch something on Netflix/Prime, or even just have a snack.
Mundane tasks are especially hard. So if there’s a way to spice them up, great. If not, other things to try might be doing a quick walk or exercise before you start, asking for help doing certain tasks, talking to someone on the phone while working, or even scheduling a block of time where you have a few hours to do the task. Whatever the case, what you experience is normal. Don’t give up!