Provided her conditions are suitable 28 Days. If conditions are not suitable she can hold her young until she dies rather than give birth. Guppies need a temperature of 73F to 75F and you will need...
In proper conditions, a Temperature of 75F and if you follow the rules you can have fry within a month. The basic rules. :- 1 inch of fish needs a minimum of 1 gallon of water. :- Every tank needs a...