What is another word for big time?
Pronunciation: [bˈɪɡ tˈa͡ɪm] (IPA) 
When it comes to expressing the magnitude of something, a common phrase we often use is "big time." However, there are many other synonyms that can be used to convey the same meaning. Some of the synonyms for big time include extensively, overwhelmingly, hugely, massively, significantly, and tremendously. Each of these words can be used to highlight the scale of achievement, success or impact, of something, or someone. For example, we can say an athlete won the race significantly, marking a considerable progress from her previous efforts. In summary, by describing situations in various linguistics nuances, we can communicate more effectively and capture the impact of it.
