Are you sure frustration is from you needing more time (ramp up to understand, go deeper ...etc.) or something else?

Perhaps you really dislike (micro)management and need more autonomy/ownership/control (or just input/participation from your end) over your time/approach/order-of-tasks?

And think/elaborate more on where this "wasted a day investigating something for nothing" is coming from.

Perhaps you're not understanding (or not even getting to hear/see) the whole picture on why "business thinks investigating that is worth one day of your salary"? Or maybe you know and disagree?

Or is it happening so much that it's basically constantly being bumped between such tasks?

Anyway - I wouldn't necessarily listen to the "you're still getting paid so who cares" advice crowd...

I believe such stuff is like cilantro/coriander.

For some of us that don't have specific genes mutations - that stuff actually smells/tastes like dish soap.

And while some people can just clock in and collect the paycheck - others are wired differently.

So really spend more time on zeroing in on what exactly is (de) motivating for you.