I bought avocado which is still not soft and I wonder how long will it take to mature?

Just leave it on the table and you will see it starts to darken in 1-3 days' time. If you buy a few, would suggest you keep some in the fridge once it changes colour so you can eat them in batches.

Grafted varieties will produce a few fruit two years after establishment (which is defined as the tree having made significant growth after planting). Mature trees can produce two to three or more bushels of avocados with good management, depending upon variety. Mexican-race seedlings and varieties typically mature during the summer; 'Lula' and most other hybrids mature in September or October. Storage on-tree is common, and 'Lula' will store on-tree into January because of cooler temperatures. Avocado fruits do not ripen on the tree--they must be harvested and held for several days. The optimum temperature range for ripening includes the cooler range of most home air conditioning settings. Avocado maturity, if unknown, can be easily determined, as the fruit is mature when it will soften to good eating quality. Pick a couple of fruit and set them on the kitchen counter (out of direct sun). A mature fruit will soften within three to eight days. If the fruit don't soften, try again every week or so with new fruit until you achieve softening. When fruit softens, check it for eating quality. Summer-maturing avocados will begin to drop heavily because of disease as they mature. Some types do not always soften well under Texas conditions. For the most part, avocados are consumed fresh, alone or in salads, dips, appetizers, guacamole and pico de gallo. Overripe fruit can be pureed and frozen for later use, particularly for avocado cream soup and dips.

Mary is right about not keeping it in the fridge. I have actually found sitting them clear of any packaging and on the wooden slatted shelf in my airing cupboard is the perfect environment to ripen them. Not sure how I found this out first time... all I know is it works a treat. 2-3 days should do it.

It will take two to three days. If you want it to ripen soon wash it, then dry and wrap in newspaper and keep in a paper bag in a cupboard.

When you plan to eat it of course its good in a salad, but try this too blend it with milk, add teaspoon sugar and a pinch of salt. I love it this way. If you want instead of sugar try honey.

im not sure how long it will take but leaving it out on the kitchen counter should help. it wont get soft in the fridge.