SetCronJob offers two types of account: FREE and Premium Account.
FREE Account is free to sign up, and you don't need to do anything to renew your account.
With FREE Account, you can create unlimited number of cron jobs with minimum interval 5 minutes.
There's only one limit: the expiry date. It's 1 month (nice, right?) for cron jobs every hour or more (hourly, daily, etc), and 2 weeks (not bad) for cron jobs every 5 minutes or more (cron every 5, 6, 12, 15, 20, 30 minutes).
After expiry date, your cron jobs will be deleted from my database, and obviously not work any more.
To renew cron jobs, simply edit and save it. In fact, when you edit and save your cron jobs, the expiry date will be recalculated according to current time; so when your cron are going to expire, edit and save cron will renew them, too.
Your cron jobs will start working right after created, and you are not required to do anything to make it work.
You must pay to upgrade from FREE Account to a Premium Account. Starting price is only $5 / year for Bronze Account, and maximum price is only $20 / year. Very nice price :)
If you would like to create cron jobs every minute or more, you must upgrade your account to Silver or Gold account.
The expiry date is still there. Although I said your cron will expire after 1 year, the expiry date of cron will be same with expiry date of your premium account.
When your account expires, your cron will expire after next 1 month.
You can renew your account any time you want by making another payment.
You can also change your account type, e.g. from Bronze to Silver, any time you want by choosing desired premium account when renewing. The remaining time will be converted according to the rate between old and new price, e.g. 6 months of Bronze account will be converted to 3 months Silver account.
With Premium account, you can create cron jobs with all features (a few now, but I'll add more), and never care about the expiry date :)
Choose which account is up to you :) If you are online too often like me, free account is ok.
Or just spend a little amount on SetCronJob, and save your valuable time. I'm sure you will be satisfied with my service :)