Upvote:-1
Usually five Years Visa is issued after a going through a strict pipe line i.e checking your income, country ties, travel history and a valid reason for multiple visits. You have the choice when ever you want to departure. Furthermore staying more then 180 days is not fruitful as it will show your wrong intentions. Otherwise its no restriction how many times and when ever you travel but you must have shown a valid income that you can travel so frequently on your own expenses or sponsor.
Upvote:1
You are not required to use the UK visa at all.
You may use the visa at any time during the dates of its validity.