Doubling Of Initial Equity

[Brian M.]

My question is on initial equity (down payment & rehab costs) and when best to sell a residential multi family property in order to roll into another investment property. 

Example: if the initial equity I have in a multi family home is $100K ($90K DP and $10K in rehab) is it best to sell this property when my initial equity of $100K doubles? Are there scenarios when holding the property for a longer period of time, even after initial equity doubles, is a wiser strategy?

Thanks