15 minutes - 1 hour
The Battery was showing signs of dying. Only stayed charged for an hour or two
With the iSclack it went really well. Super easy to get into. And not much needed to come apart. But the battery took the longest to get it unglues from the back of the device. Like 10 mins kinda unglued.
Try and warm up the glue if possible. Using the iopener kit. If not just go slow and be paitent. As there are cables under that battery.