When do my credits quotas reset?

Daily (requests) quotas reset every 24 hours based on the starting time of your subscription (or free trial).
Similarly, monthly (credits) quotas reset at the same time each month, according to the date of your plan’s starting time. 

You can easily keep track of your quotas and reset times by checking the ImportFromWeb sidebar: reset dates are specified in the Monthly credits and Daily requests limit tooltips.

Current period: the period of the current monthly cycle.

Monthly credits: the number of credits that have been consumed in the current monthly cycle out of the total credits quota available in your plan.

Daily request limit: to manage concurrent requests between all users, the numbers of requests that can be performed in a day is limited (you can still upgrade your account to get higher daily quotas).
Your daily quota resets every 24h (the reset time is specified in the tooltip)

Total credits used: the total number of credits ever consumed.

To see a detailed log of your requests, click ‘Show requests from current period”. A new tab will open on your spreadsheet showing all your requests over the last 30 days.

Your timezone is specified in the tooltips. You can always change your spreadsheet timezone setting from the menu File >> Settings