Past simple VS present perfect

0 Hi all, 02br
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00In most cases it's clear which tense I should use but in some cases it's really puzzling. 02br
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00For example :- 02br
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001- If I want to tell my friend that I played/ have played football without specifying when or for how long, should I say I played football or I have played football. Please elaborate so that I can understand. 02br
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002- I monitored/ have monitored the stock market from 1 p.m to 2 p.m. It's now 5 p.m and I want to tell my friend that: should I say I monitored it or I have monitoed it. 02br
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003- It's now 5 p.m, which one is correct: -I monitored it for two hours or I have monitored it for two hours. 02br
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00I hope that my questions are understandable and clear. 02br
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00thanks in advance 0-