Yes, that's a long day of gardening. Of course, which hours and how many is part of any work agreement. You work what you promised to work -- I don't know that anyone here can change that.
You sound confused about taxes. If you're an employee, taxes are deducted from your pay; if you're self-employed they aren't. Self-employed means you have to add a "Schedule C" (Profit or Loss from Business) to your 1040 and pay the self-employment tax at that time. But no matter what, you submit a 1040 tax form each April. Note that there is some small amount of income you can make on your own before it must be reported -- I think the amount is around $2,500 per year and it varies from state to state.
You sound confused about taxes. If you're an employee, taxes are deducted from your pay; if you're self-employed they aren't. Self-employed means you have to add a "Schedule C" (Profit or Loss from Business) to your 1040 and pay the self-employment tax at that time. But no matter what, you submit a 1040 tax form each April. Note that there is some small amount of income you can make on your own before it must be reported -- I think the amount is around $2,500 per year and it varies from state to state.