If you have 1.2m, why invest 100k and leave 1.1. m sitting in the bank to be invested weekly at the rate of 100k per week? For 12 weeks (3 months)! With that strategy, you’ll be investing the last 400k in the 3rd month...effectively losing out on interest you could have earned now. A bird in the hand.......Split the amount but not into 12 bits...way too much work – considering you’ll have to place your bid every week, then pay up (depending on the mode of payment)

I dont stockpile cash waiting for the right time to invest. Assuming you’re saving continuously, make a habbit of putting whatever “idle” cash you have in your account in a short term T/Bill while deciding what to do with it.

Rolling over. They’ll usually notify you a week to maturity and ask whether you wish to roll over. I prefer rolling over when they ask since it allows me to decide whether there’s nothing better to invest in. Should you wish to top up the amount you simply indicate the top up amount on the same form.