As far as we know there are no limitation/restriction on how many data/events that can be fetched at a time by using the API. However, one possible question here arises is whether your Clockify workspace is on a subdomain(eg. something.clockify.me) ? If yes, then in that case your API key will work just for that workspace. As mentioned over the Clockify API documentation(https://clockify.me/developers-api “        Authentication All your requests should include "X-Api-Key" in request header, containing your API key. If your workspace is on a subdomain (eg. something.clockify.me), you'll need to generate a new API key in your Profile Settings that will work just for that workspace.” ... View more