The term array is a bit misleading since you are using a function string parameter.
The variable has no derived methods that you can access, unlike objects, so variable.width doesn't work here.
However, assuming you have a delimiter , e.g. "," you can access parts of the string and parse them.
tokencount(arrToSpeak,",") will get you the count of elements
Since in your case they go in pairs, the amount of "array" elements is tokencount(arrToSpeak,",")/2+1
To access a certain element inside the string, you can use tokenat(arrToSpeak,index,","), so tokenat(arrToSpeak,0,",") will get you the first text, tokenat(arrToSpeak,1,",") will get you the first value in seconds, and so on.