Yes, you can wait as long as you want between rounds. But the whole idea is to put pressure on the Respondents/Libellees, so you don’t want to go too slowly.
Once you get to the Notices to Debtor stage (rounds 7-9), you will then have the option to delay enforcement, which would increase the amount that you would be enforcing.
This is because any amount to be enforced would have to be at least 90 days in arrears. So this means, if you delay the sending of your 1st Notice to Debtor (round 7) by another 60 days, you could enforce the amount of your 3rd Bill (round 6) instead of the amount of your 1st Bill (round 4). And this would be significant increase in the amount of liability being enforced.