There are a lot of PowerUps that will enable you to track time.
If you type in 'hours' in the PowerUps list this is what you get:
And if you type in 'time' you get loads as well:
I don't know if this is the kind of reporting you're looking for?
Some PowerUps are free and others are paid for, you'd need to go through them and see which one you wanted to use to see if they're free or not. Unfortunately, there's too many to go through, and some have a free element and then there's a paid-for version after that. I don't know what you would be looking for, so I couldn't advise which one to look at I'm afraid.
PowerUps are available to all tiers of Trello, although, with the Free version, you have 1 per board, Gold gives you 3 per board and BC (Business Class) gives you unlimited PowerUps per board (but BC is expensive, so I would caution to fully look into this and know exactly what you're going to be spending before you get it. I'm a BC user, so I'm more than happy to go through this with you).
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