I have a Pachyphytum compactum and it needs more water than my other succulents (learned the hard way, once it wrinkled so much until I found help on this forum). Water thoroughly as Rina suggested above. Frequency of watering depends on where you live and the potting mix you use. Re the yellowing, if it's not mushy, I wouldn't worry, especially on bottom leaves. Mine do that. But, do please check for sign of rot. Good luck!!

Thank you guys. Soil mixture consists of gravel, sand, garden soil, and small amount of manure. It have great drainage, water runs off easily. According to florists' story it is most probably direct sun in the window that is causing this occurrence. Thanks again and if anyone have good recipe for home made succulent soil mixture, please share your wisdom with me. :D

It is definitely not direct sun that is causing this, if it were, it would also likely be sunburned. If it is a cutting, then wrinkling is normal. If it was plump before and is wrinkled now, I would uproot it to make sure there is no rot. I would also give them more sun. Good luck

There is no way that an indoor Echeveria or Pachyphytum being watered every 3 days is not getting enough water. It's too much water, and almost certainly poor drainage, but there is also a chance that the problem has led to stem rot.

Make a new mix without sand or manure. Manure is more likely to kill than help a succulent. They live in very dry conditions with little if any organic matter. Sand doesn't allow enough gas exchange and retains too much water. Once it's in a better mix, allow the top 1/2 of the soil to completely dry out between waterings.

A mix of at least 50% perlite is adequate for most growers. If you tend to baby your plants to death, eliminate the organic material entirely and use a gritty mix. If you use a gritty mix, you can get away with watering so frequently, but no other medium drains fast enough for an indoor succulent to survive being watered every 3 days.

If the stem has rotted or died (I recently bought an Echeveria moranii that had done this), then it'll continue to shrivel despite a new mix and drier conditions. If after a couple weeks in healthy soil or grit, it is stl shriveled, check back here and someone will help you figure out whether the stem has died.

Garden soil and manure are not suitable for container growing of any plants, even less for succulents. Sand comes very close...unless really grainy.

How do you know your mix has great drainage? Try chopstick/bamboo skewer test: insert about 3/4 deep into the soil. When you pull it out and find small particles sticking to it, or if it feels damp-cold when touched to your cheek or top of your hand, mix is still too wet. No water.

Without trying to be nasty, do not get more advice regarding succulents from the florist - so far, she/he has been incorrect.