Ganesh Chaturthi which is also called as Vinayaka Chaturthi is an auspicious occasion that is celebrated for ten days for each year. The festival is celebrated during the August or September months of Bhadra month of Hindu calendar. Post the completion of 10 days of the festival, the festival ends up with the bidding on goodbye to Lord Ganesha, and his idol is then immersed in water.
Similarly, the money and gifts offered to the deity must not be kept at home and instead must be donated to needy or the local temple. You can opt for DIY solutions for your plan on creating Ganesha.
As a result, you can keep the idol for 1 ½ day, three, five, seven and up to 21 days before visarjan.