For recurring gifts, nothing prevents the donor from making an annual pledge for 50+ years, or a monthly recurring gift for just as long. All of us are bound to counting parameters for our campaigns (generally 5-7 years would be the maximum allowed for general pledges) so we are constantly going back to donors to tell them we have to shorten the commitment they made.  We would appreciate functioality, just like that that sets a minimum installment amount, to set a maximum payout period or installment count. Thank you for your consideration.