Can 持续 have these 2 meanings? I found these 2 example sentences, with English translations, for 持续。They are very different in meaning. Are both ok?


高温天气持续了几天。 The hot weather went on for some days. 持续 = continued
这足以持续到周末。It is enough to go on the weekend. 'go when?' 'on the weekend'


In 2., 'go on' does not really belong together, nor is there any sense of 'continue to do sth'.
Yes. It seems you understand the first sentence pretty well.

Regarding the second sentence, I think you're confusing 持续 and 足以. 足以 is the word that means "enough". 

这足以持续到周末 = This is enough to last until the weekend.

The key here is that 持续 indicates a persistence, something that continues on.