You should have a long-term plan to invest in Bitcoin so that you can grow your wealth, but we can never determine the value of Bitcoin, however, if you have money left over from your income source after meeting the needs of your family, you can invest in Bitcoin regularly or weekly or monthly according to your ability. In this way, if you continue to invest for a long time, your investment will start to grow stronger.
Consider Bitcoin investment as a type of savings, which can be called Bitcoin savings. Set a goal and keep chasing that goal consistently. How long your savings journey will be depends on your goal, but at least keep saving for a cycle (4 years). There is no specific time limit on how long you can extend it, in this case you have to prioritize your goal. It is your sole decision whether to extend your savings journey or stop after achieving the goal. One thing that is advisable is that never sell the entire investment.